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• Hadoop is not able to find JAVA_HOME properly

  - by Shekhar

  I am trying to run hadoop my Ubuntu OS. I have set JAVA_HOME variable in ~/.bashrc file to /usr/lib/jvm/jdk1.7.0_01/ but when I run hadoop namenode -format command it fails with following errors : shekhar@ubuntu:/usr$ hadoop namenode -format Warning: $HADOOP_HOME is deprecated. /host/Shekhar/Softwares/hadoop-1.0.0/bin/hadoop: line 321: /usr/jdk1.7.0_01/bin/java: No such file or directory /host/Shekhar/Softwares/hadoop-1.0.0/bin/hadoop: line 387: /usr/jdk1.7.0_01/bin/java: No such file or directory hadoop tries to locate java command at /usr/jdk1.7.0_01/bin/ path. Clearly somehow it missed /lib/jvm folder. I am not able to understand why and how this is happening. my echo $PATH command gives following output : shekhar@ubuntu:/usr$ echo $PATH /usr/lib/jvm/jdk1.7.0_01/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/lib/jvm/jdk1.7.0_01/bin:/host/Shekhar/Softwares/hadoop-1.0.0/bin If I run which java command I get following output : shekhar@ubuntu:/usr$ which java /usr/lib/jvm/jdk1.7.0_01/bin/java and echo $JAVA_HOME returns following output : shekhar@ubuntu:/usr$ echo $JAVA_HOME /usr/lib/jvm/jdk1.7.0_01 I would like to know why hadoop is taking JAVA_HOME path incorrectly. Please help...

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• Changing PATH Environment Variable for all Users. (Ubuntu)

  - by Wally Glutton

  I recently compiled Ruby Enterprise Edition (REE) on an Ubuntu 8.04 server. I would like to update my PATH to ensure this new version of Ruby (found in /opt/ruby_ee/bin) supersedes the older version in /usr/local/bin. (I still want the old version around, though.) I would like these PATH changes to affect all users and crontabs. Attempted Solution #1: The REE documentation recommends placing the REE bin folder at the beginning of the global PATH in /etc/environment. I altered the PATH in this file to read: PATH="/opt/ruby_ee/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" This did not affect my PATH at all. Attempted Solution #2: Next I followed these instructions and updated the PATH setting in /etc/login.defs and /etc/crontab. (I did not change /etc/sudoers.) This didn't affect my PATH either, even after logging out and rebooting the server. Other information: I seem to be having the same problem described here. I'm testing using the commands "echo $PATH" and "ruby -v". My shell is bash. My .bashrc doesn't override my PATH. Yes, I have heard of the Ruby Version Manager project. ;)

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• Windows media scaling/interpolation method

  - by MichaelH

  Usually in Windows, if videos or other media is upscaled from a certain resolution to a higher resolution (e.g. "monitor size"), a bilinear filtering algorithm or similar is used, such that the upscaled material doesn't look blocky. On my system however, the used interpolation algorithm changed from 'bilinear' to 'nearest neighbor' at some point, with the effect that upscaled videos (e.g. viewed in MPC or WMP, and also Skype video streams) and games (e.g. from PopCap) appear rather blocky. Not sure what the common factor between those is, could be DirectShow(?). I am not aware of having changed any setting that could have affected this state, in fact I am not even aware such a setting exists. I'm guesing that some installed software must have changed something on my computer. My computer is running Windows 7, but I had already experienced the same effect on an XP machine some while ago, where it changed back again to the more pleasing bilinear interpolation after a while, as magically as the first time. What could be wrong with this installation, and how can I change this upscaling interpolation behavior?

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• Why is writing to my external hard drive slow, while benchmarks show fast writing?

  - by matix2267

  I have an iOmega eGo 320GB portable drive connected through USB2.0 to my laptop running Windows Vista. It's been working fine for quite some time until recently it became very slow when writing e.g. when copying ~300MB movie over to the drive at first it is extremely fast but it actually doesn't write it only puts in cache and then hangs on last 10-20MBs for about a minute. When copying larger files it's the same story: starts fast but then slows down to ~5MB/s (sometimes even slower down to 2MB/s). Strange thing is that I have always had caching disabled for this drive (it was disabled by default and I never bothered changing it). At first I thought that the disk is dying so I checked S.M.A.R.T. values and everything is fine there. I also run chkdsk and it seemed to fix the problem - it worked fast for a few minutes but then it slowed down again. I also tried plugging it into another USB port - no difference. Additionally I noticed that reading under certain circumstances is sometimes slower e.g. loading times for some games are ~10 times longer, whereas simple copying files from this drive to my internal HDD is fast. I ran a speed benchmark using CrystalDiskMark with a 5x100MB run and strangely got these results: read write (MB/s) Seq 33.05 28.25 512k 17.30 15.27 4k 0.267 0.372 4kQD32 0.510 0.260 This is different from what most other people have (I've found many threads about slow disk write while googling but all of them were slow on benchmarks too) which is why I decided to post this problem here. BTW most of the time when writing (or sometimes reading) the activity led is mostly idle (blinks a while and then stops for longer, sometimes has slower blinks ~1 sek, sometimes goes off for a few seconds - extremely long blink :) ) but when benchmarking, defragmenting or just reading (copying from this drive, installing apps from installers there, watching HD videos) it is blinking really fast (like it should) and there are no slowdowns. It shouldn't be driver issue unless stock Windows drivers have some issues I'm not aware of.

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• ACER ASPIRE V3-571G-9435 Fan not kicking in leading to overclocking

  - by brythespy

  This laptop has always had this problem. The temperatures kick up to the thermal ceiling of 99C for the CPU (i7-3610QM) and 94C for the GPU (GT 640M). Problem is, the FAN doesn't give a damn. It's actually QUIETER when the temperatures are that high, than when it's at 60C or so. I figured it was a problem with the BIOS, so I updated that, no change. So maybe it was a problem with windows? Nope, same result on gaming with Ubuntu. The major problem of this, is that after gaming for ten minutes the CPU throttles itself to 1197MHz(as opposed to 3193), and the GPU goes down to 135MHz( as opposed to 843MHz). The problem is that the fan won't kick in like I know it can, because when the laptop is in POST, like at BIOS setup, the fan is like a vacuum cleaner it's so loud! I don't really care about noise, so I'd love to have the fan like that all the time as long as the temperatures don't fly through the roof... So, things I've tried so far, to avoid possible duplicate answers. Checked for dust: It's been this way since the laptop was new, and I've since then taken it apart. No dust buildup. Background stuff running?: No, problem persists across OS'es, and it happens while gaming anyways Manually underclocking both CPU/GPU: Using windows, I can force the CPU to stay at 1.1GHz, but the temperature STILL easily hits 99C after 5 min of gaming Contacted Acer support?: No help at all. They told me to update and reset the BIOS, which I have done multiple times. There are only about 6 changeable things anyway, none of which should affect the FAN control Third party fan control program?: None detect the fan So, I'm screwed until I can afford to replace this laptop, but I am very satisfied with performance in games... Whenever the CPU/GPU aren't being throttled. Anyone that can offer advice to solve this problem would be greatly appreciated. Hell, if you solved my problem I'd send you some monies through paypal.

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• Linux virtualization choices with graphic acceleration / video card support

  - by Urbn

  I am in the process of building a new desktop machine for work and fun. I am looking to run a undecided flavor of Linux (guessing Ubuntu) as my primary OS and several Windows installs with a Windows 7 install for .net development and gaming as virtualized environments. From my previous experiences with virtualization software in Linux I was never able to find an application that offered descent video card support / graphic acceleration etc. to be capable of playing any games within one of the virtualized environments. And since I will be investing quite a bit of money into this system for gaming I would naturally want to find the best option available to achieve this setup. So Onto my question: Is there any virtualization software available for Linux that has full video card support, graphic acceleration and capable of taking advantage of everything the video cards have to offer within the virtualized environments? Or am I stuck with running Windows 7 as my primary OS and using virtualization for Linux and the other OS's? Also I have no preference on open/closed source and price range would be up to $175.00 to support at least 3 virtualized environments.

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• How can one use online backup with large amounts of static data?

  - by Billy ONeal

  I'd like to setup an offsite backup solution for about 500GB of data that's currently stored between my various machines. I don't care about data retention rates, as this is only a backup of, not primary storage, for my data. If the backup is stored on crappy non-redundant systems, that does not matter. The data set is almost entirely static, and mostly consists of things like installers for Visual Studio, and installer disk images for all of my games. I have found two services which meet most of this: Mozy Carbonite However, both services impose low bandwidth caps, on the order of 50kb/s, which prevent me from backing up a dataset of this size effectively (somewhere on the order of 6 weeks), despite the fact that I get multiple MB/s upload speeds everywhere else from this location. Carbonite has the additional problem that it tries to ignore pretty much every file in my backup set by default, because the files are mostly iso files and vmdk files, which aren't backed up by default. There are other services such as EC2 which don't have such bandwidth caps, but such services are typically stored in highly redundant servers, and therefore cost on the order of 10 cents/gb/month, which is insanely expensive for storage of this kind of data set. (At $50/month I could build my own NAS to hold the data which would pay for itself after ~2-3 months) (To be fair, they're offering quite a bit more service than I'm looking for at that price, such as offering public HTTP access to the data) Does anything exist meeting those requirements or am I basically hosed?

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• Advice on Computer Specs for overall development/general use machine

  - by Ender

  At the moment I am restricted to a laptop with 512MB of RAM, a 120GB HDD and a 1.5GHz Intel processor for all my development and general browsing needs, and as you can probably tell using it for anything modern is a painful experience. As a result I've decided to buy myself a new desktop computer, one that will stand the test of time and one that can be upgraded easily. Rather than build the machine myself I've decided to go through Dell as I've had good experiences with them when purchasing computers for my family. I've had my eye on this as it's got a good amount of RAM, has a decent-rated processor and isn't priced too badly. http://www1.euro.dell.com/uk/en/home/Desktops/inspiron-580/pd.aspx?refid=inspiron-580&s=dhs&cs=ukepp1&~oid=uk~en~20211~inspiron-580_d005827~~ Intel® Core™ i5 Processor 750 (2.66GHz, 8MB) Genuine Windows® 7 Home Premium 64bit - English Display Not Included ATI Radeon™ HD 5450 1GB DDR3 graphics 6144MB Dual Channel DDR3 [3x2048] Memory 1TB (7200rpm) SATA Hard Drive DVD +/- RW Drive (read/write CD & DVD) with DVD Burn software 1 year of coverage included with your PC McAfee® Security Centre - 15 Month Protection - English After the pain of using a slow laptop for all this time the main thing I want is speed. I may look to play a couple of basic games on it, nothing too powerful. Obviously I'll be doing some development on it too so it'll have to be able to handle the latest IDE's and Database tools like SQL Server pretty quickly. Finally, should I ever need to improve it I'd like to be able to add more RAM and change some of the parts. I wouldn't have thought this would be a problem but a few people I've spoken to have said that the amount of RAM the motherboard can handle isn't that great. Is this true? How long can I expect to be using this computer before it's too slow? Thanks in advance for the help.

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• Touchpad does not respond when I am holding key on the keyboard

  - by Tadeck

  I am experiencing strange problem with using my touchpad and keyboard simultaneously under Windows 7. I have HP tx2550ew (convertible tablet), and when I hold some key under Windows 7 (eg. space, a, s etc.), the touchpad seems to be blocking. I spotted this while playing Counter Strike. I am not playing much games, and I haven't been playing CS since January, so I am not sure when it started behaving like that. I have tested it also outside the game - when I hold space (eg. when on some web page and entering text into input field) or some letter key, the cursor is not able to move. The problem seems to not be occuring when I hold Shift, Ctrl nor Alt. Did any of you experience similar problem? Do you know what may have caused this? Is there any way I could check what is wrong with my laptop? I have been looking for a solution, but it seems I haven't been looking in right places. This is why I ask question here. Ps. I am unable to test whether this is touchpad-specific, because I have no mouse at my disposal at the moment (got used to touchpad so much I even find it more efficient and haven't been using a mouse with my laptop for months).

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• Switching from Onboard intel to Nvidia Dedicated GPU

  - by Anarkie

  How can I switch from Intel onboard grpahics to Nvidia Dedicated GPU? When I go to windows screen resolution I see intel. I cant change it. I go to Device Manager, I see both Adapters are there and Nvidia is known.I disabled intel, I didnt see any option to set one as primary so I disabled intel, black screen!Reboot and re-enable intel. I right click on the desktop, choose "Nvidia Control Panel" and on 3D options I chose the desired game I want to play, High performance Nvidia, but it didnt switch when I started the game. Then I made preferred GPU in the global settings High performance Nvidia for everything it still didnt change.I understand to save the battery etc. there is a switch option between these two but I dont see this switch when it is necessary, I cant also switch manually?Is there a manual switch FN key?I looked but couldnt find. Why I want to do this? 1) Better game peformance. 2) I want to play an old game from 2002(Diablo 2 LOD), when I start the game there are black bars on the sides, so screen becomes just smaller which I dislike!I heard this is intel's specification to center the display.But instead I would like to scale or expand it to fit widescreen(fullscreen).Which should be possible with Nvidia. My Notebook Specs: Fujitsu Lifebook AH531, Win7 , 64 bit, i5, intel HD graphics onboard, Nvidia GT 525. I didnt install Nvidia later, it was always installed and ready from the moment I turned on the computer first time. How I determined that the cards werent switched when I am playing the game: with the windows key I exited from the game, then looked at screen resolutions menu, still saw intel, also the game was still with black bars.I know intel GPU should enough for Diablo 2 but I am interested in this answer for further games, I dont always play Diablo, what if I install an up to date game for example?Then Intel will not be sufficient.I would like to learn the switch option.

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• Hard crash when using bluetooth headset on MacBook Pro and Lion 10.7.2

  - by jtalarico

  I recently picked up a bluetooth headset (Motorola S10-HD) and started using it with my MacBook Pro (17" purchased new in 2010) running Lion 10.7.2. Here's what works - stereo audio: iTunes Spotify Pandora (via browser) games (e.g. Minecraft, which is a Java app) audio from YouTube Plex, VLC, other video players Here's what doesn't work well - stereo audio fails and the headset seems to go into mono (i.e. tinny-as-hell) mode: Google Hangout Skype GoTo Meeting Here's what's just downright catastrophic. If I'm listening to stereo audio and then decide to jump into a Skype call (Google Hangout, or GoTo Meeting), bluetooth often crashes and I can only get things working again by shutting down the device, disabling bluetooth, and getting things back up and running again. But the audio is still horrible, and MUCH better using just a simple set of iPhone earbuds and mic. About 80% of the time during such a call, bluetooth crashes. And about 90% of the time, after the call ends, Skype is shut down, or I try to switch back to playing stereo audio, I get a hard crash!! The gray screen of death descends and I'm told I need to restart my machine. In one such instance, even after a reboot, I could not enable bluetooth again ("Turn Bluetooth On" was grayed out in taskbar). Is this just a weak implementation of bluetooth by Apple, or is this a hardware issue? I've seen others posting similar issues even on the Apple support site indicating that bluetooth headsets are failing left and right, but I haven't seen anyone mention hard crashes.

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• Performance decrease in every game and application

  - by Márk Vincze

  When I start a game, initially it runs smoothly, but after a couple of minutes, the performance gradually decreases to the point of being unplayable (1-2 FPS). The sound also starts to lag at this point. This does not happen every time I start my PC, usually exiting the game, rebooting, then starting the game again solves the problem, and I can play with perfect FPS for as long as I want. I could not find any deterministic reason when this happens and when doesn't. It happens in every game I tried (SWTOR, Diablo 3, Skyrim), and not even games, but simple applications like a browser or the Control Panel can get unusably slow. This is a brand new PC I bought three months ago, and this problem occurs since the first day I've been using it. Could you provide any advice how to further diagnose the problem? I tried to reinstall Windows, and tried different video card drivers, but it did not help. It would be important to know whether this is a hardware or software problem, because I can use the warranty if it is a hardware issue. (I did not want to return the PC yet, because I can't reproduce the issue deterministically.) Spec of the pc: Motherboard: ASROCK H61M-HVS CPU: INTEL Core i3-2120 3.30GHz 1155 BOX Memory: KINGMAX 4096MB DDR3 1333MHz KIT Video card: GIGABYTE GV-R685OC-1GD HD6850 1GB GDDR5 PCIE HDD: SEAGATE 500GB Barracuda 7200rpm 16MB SATA3 ST500DM002 I am using Windows 7 64 bit. Thanks a lot in advance!

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• How do I lower the hardware volume? (volume too high)

  - by Zom-B

  I have a 4yo Dell laptop with Windows XP Pro (modern ones unfortunately don't have a physical volume knob), and lately I'm using my Apple earphones, because they have much better low frequency response than my $10 earphones. They also have the side effect of being much louder. To give an indication of my agony, for most tasks (movie, music, games) I have my main volume at 3 ticks: drag to 0 with the mouse and press the up key 3 times (the handle does not even raise 1 pixel) and my wave volume at 50%. I notice that when I do this, I have a lot of digital noise, because I'm using just a tiny fraction of the 16-bit space. If I drag the Wave slider down until I barely hear the audio, it becomes really distorted and noisy, indicating that this is digital volume (in the DirectSound driver or something) and not hardware volume. I experimented in Audition. When I make a tone of 1000Hz at -50db, (all windows volumes at max) the volume is just below my pain threshold. When I zoom in to see how high the sample values reach, I see that just 8 of the 16 bits are used (about -100 ~ 100). When I generate such tone at -80db (minimum I can specify) then I can still clearly hear the tone, although really noisy. When I zoom in, I see that just 3 out of 16 bits are used. I created a squarewave tone that is just 1 bit high, and I can still hear it! For most uses, this is not a big problem (audiophiles will disagree!), as I just have more noise than usual (about the same as old 8 bit hardware), but I'm also in the process of programming a hearing test program, in which case this problem is a death blow as the test subjects will even hear tones at the bottom of the theoretical range (lowering the windows volume is futile, see above) (I cannot update drivers, as Dell has discontinued XP support for my model)

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• Transfer disk contents *without* cloning tools

  - by Chris Cummins

  Is it possible to "clone" a disk which contains programs by performing a copy of all the disk contents (preserving file attributes) from source to destination disk, and unplugging the source disk and changing the drive letter of the destination disk to match that of the source? Context I have a two disk Windows 8 system with a system drive and a data drive. Recently, the data drive developed a number of bad sectors leading to IO errors. I have been sent a replacement drive so I simply need to clone the contents of this data drive onto the replacement. The drive contents include documents & media, user folders (My Documents and related), and some programs (games etc). Problem The problem is that the bad sectors on the source disk causes most disk cloning tools to fail with read errors. Attempted approaches include: Disk clone from live boot environment with Acronis True Image. Fails due to read errors. Disk clone from live boot environment with Clonezilla. Fails due to read errors. Disk clone using Roadkil's Unstoppable Copier. Fails due to hardware timeouts in the HDD (application hangs indefinitely). A straightforward copy from source to destination disk using FreeFileSync (preserving file attributes and metadata). This succeeds. So at the moment I have a replacement disk which contains all of the data from the original disk. Now all I need to is somehow get Windows to replace all references to the old disk to the new one. Is this possible by simply swapping the assigned drive letters? Any help would be greatly appreciated, thanks!

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• need to bring back win 7

  - by user290513

  I like making music and playing games and occasionally do some Photoshop. I had a windows 8 computer but my mouse pointer always got stuck, so to try out something new I installed Ubuntu. here is how I installed it: Went to advanced statup options clicked on "use a device" after plugging in my bootable USB with Ubuntu replaced my windows 8 and installed Ubuntu 14.04 LTS I hope I did it correctly though. So after a few months I could've really find out a good Audio Production (not LMMS, because I use Stagelight) software nor something that could be familiar to the UI of Photoshop. So I decided to bring back Windows, but because of the bad experience of 8 I thought about bringing back win 7 So I used an app named WinUSB to make my bootable USB drive after formatting it to NTFS in GParted But when I go to my grub menu, my USB doesn't show up and my PC being a UEFI device. I don't know how to get to the bios of my device. Can somebody tell how to install Windows 7 completely and deleting Ubuntu or at least give me a link to a tutorial. I have a netbook: it is an Acer Aspire One 725. I'm fine with using commands in terminal and another thing that my laptop doesn't have a CD drive or reader, I can't put a CD inside

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• my cpu won't start. all fan were spinning for a second then nothing happen

  - by Tommy

  I need help about this.. I'm from Malaysia.. Back then my cpu is all okay..and it's 4 year old.. I think this question is answered before but i'm still don't understand.. when i plugged my cpu..turn it on and all of the fan (graphic card, mobo fan and PSU fan) were spinning just for a second than nothing happen.. I don't know if it is because of the PSU or my mobo.. I sent my cpu to the shop and they said it must be the mobo.. They tell me to change my mobo and PSU also..and it cost over 100 buck (rm300 in Malaysia). and i'm real 'dry' right now. My whole data is inside the HDD. School projects, photos, games, and many..I really-really need my cpu back alive.. My mobo is MSI MS-7529 with dual core chips. My PSU is ATX-480W. the PC store guy said i need to change to new ASUS mobo if I want. I dont know what type it is but Then he tell me to change my PSU also because he don't think my old PSU (ATX-480W) ain't compatible to the new mobo.. I was very need a help from you techie guys.. sorry for my terrible English..

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• Serious 64-bit laptop

  - by Daniel Gehriger

  For the past couple of years, I have been using an IBM Thinkpad T60p for daily work (software development, desktop & embedded). I am extremely satisfied with this machine, due to its robustness. It also has a few features I depend on: a high resolution display: 15.0" TFT FlexView display with 1600x1200 (UXGA); excellent keyboard; decent graphics and CPU performance. Some of the software I develop benefits from larger amounts of RAM, and 3GB (Windows 7 32-bit) or 4GB (Windows 7 64-bit on T60p) are no longer sufficient. My customers run desktop computers with 20GB and more, and I need to have at least 8GB to at least be able to run reasonable test cases. So I'm shopping around for a new laptop, but I'm struggling to find anything that matches my requirements: must run Windows 7 64-bit Pro or higher; must support at least 8GB of RAM (more is better) high screen resolution! While I prefer 4:3 I can live with wide screen. But I really hope to find something with a vertical screen resolution similar to what I have now... portable, so < 16" but = 14" I realize that FlexView isn't available anymore, but I'd like to avoid a glossy screen if possible. decent (not more) graphics performance, ideally hybrid (I'm doing a lot of CAD, never games). good keyboard reasonable CPU -- but I'm still fine with my current Core 2 Duo, so that shouldn't be too complicated. The T60p fits all those requirements, except the 8GB of RAM. Can you help me find a current notebook that would match most of them? I don't mind changing brand. Thanks!

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• Broken Vista. Can't open Windows settings.

  - by serena

  My neighbor has a Lenovo laptop with Windows Vista Home Basic. She's a noob and just uses the laptop for internet purposes. She said she had to close down Windows improperly (sometime ago, maybe 6 months) because of system freeze. She realized there's something wrong with her Windows when she tried to open Windows update settings. I took a look at the system and determined the following errors: When I click on Windows Updates, a bare white window opens for a sec. and closes immediately. When I try to open Computer Properties, the same thing happens. (Windows+Break doesn't work either.) When I try to open Bluetooth settings, the same thing happens. So Vista won't let me open any Windows settings, but installed programs work correctly (games, applications etc.). She has no Windows Vista discs since the laptop came with preinstalled genuine Vista. She also has no recovery discs. I don't think there is a system restore point for the time the system was stable. Now what can we do to solve this big problem?

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• Computer making strange sound when turned on, ever since power outage

  - by Dot NET

  Recently we experienced a power outage, and the PC was off. However, once the power came back, I switched on the PC and heard a strange noise - almost as if the hard disk or fans were struggling to work. I can't really describe the sound, but it's a laboured, loud sound almost like a jack-hammer. This has been persisting ever since the power outage, however the noise stops after around 10 minutes or so, and doesn't start again until the computer is turned off and on again. At first I thought it had something to do with the HDD, but all my files are intact, chkdsk did not report any issues and performance is 100% unchanged, even in games (so the gfx card is fine, and so is the HDD most likely). My PC setup basically has around 3 cooling fans, but I'm not sure if it's one of these either as the noise actually stops after 10 minutes or so, and if I leave the PC on for 4 hours (for example) the noise never starts again. It's there solely when turning on the PC. I haven't got a UPS, and it's important to note that the computer was not on when the power went out - it was merely plugged in. I then promptly unplugged the PC once the power was out, and only plugged it in again when the power came back. Could it be the power supply? Unfortunately I can't open my tower as I would void the warranty. Are there any tests which I could carry out without voiding the warranty?

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• Screen randomly goes blue/black/white

  - by FubsyGamer

  Problem Randomly, while using my computer, the monitor goes dark grey/almost black, or it goes white with faint grey vertical lines, or it goes blue with black vertical lines. It's as if the computer powers off. People tell me I sign out of Skype, Spotify stops playing when it happens, etc. When I look at the tower, it doesn't seem like it's off at all. Nothing changes, fans are spinning, lights are on, etc. If you were only looking at the tower, you'd never know there was a problem The only way I can get it to come back up is to push and hold the power button and turn it off, then back on This never happens while I'm playing video games. I've done 5-6 hour sessions of League of Legends, and it doesn't do anything When I'm just browsing the web, reading email, checking Reddit, etc, it happens all the time. It can happen multiple times in a session, it usually takes only about 5 minutes from the time I start browsing to when the computer crashes This started happening after I moved to a new apartment (this has to be relevant somehow, it was not happening where I lived before) There is nothing in the crash logs or event logs System Specs i5 2500k CPU AMD Radeon 6800 GPU Gigabyte z68a-d3h-b3 motherboard WD VelociRaptor 1 TB HDD Screenshots Device manager About screen Things I have tried I was getting a WMI Error in my event logs, but I fixed it using Microsoft's fix, KB 2545227 I was using Windows 8. I wiped the HDD and downgraded to Windows 7 64 bit I took out the video card and used a can of air to totally clean out the video card, all fans, and the inside of the computer in general. I made sure all of the video card pins were fine, then reconnected it I tried to update my motherboard BIOS, but anything I downloaded from Gigabyte was only for 32 bit machines, not 64. I don't even know how to tell what my motherboard BIOS is at right now I am using a power strip, and anything else connected to it works just fine If I re-seat the monitor cable while this is happening, nothing changes Please, help me. I've been battling this for several weeks now, and it's so frustrating it makes me not even want to use the computer.

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• At what point does the performance gap between GPU & CPU become so great that the CPU is holding back a system?

  - by Matthew Galloway

  I know that generally speaking for gaming performance the GPU is the primary factor which holds back performance, with everything else such as RAM/motherboard/PSU/CPU being secondary in importance to the graphics card. But at some point the other components ARE going to be significant in holding back the whole system! For instance nobody would be silly enough to play modern games with 512MB RAM and the very latest graphics cards (such as an HD7970) as I bet the performance increase over such a system with only 512MB but a mid range card would be non-existent! Thus it would be a "waste" for such a person to buy any high end graphics card without resolving first the system's other problems. The same point applies to other components, such as if it only had a Pentium II a current high end graphics card would be wasted on it! So my core question is how do you determine at what point for your system is spending on extra GPU power be completely "wasted"? (also, a slightly more nuanced question is trying work out at what point might the extra graphics power not be "wasted" but would be "sub optimal" value for money, when the expenditure should then be split around graphics card and other components. As obviously a gamer shouldn't always just spend on upgrading the graphics card! But needs to balance it out)

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• Windows 8 Windows Store (Metro/ModernUI) applications not working (just show 'busy' animation or white screen)

  - by davidm_uk

  I have a Dell XPS 15 which shipped with Windows 7 x64, which I recently upgraded to Windows 8. The process went surprisingly smoothly (given that this was an upgrade, not a complete re-install), and the system generally seems very stable. However, today I noticed that several of the Windows Store apps don't work: they all behave in the same way, launching but then showing a spinning 'wait' animation indefinitely. This is affecting the standard Microsoft Mail, Store, Weather, News, Travel, Finance, Sport, Games and Music apps. The Bing app just shows a Bing logo on a coloured background (but no wait animation). The Calendar, Photos and SkyDrive apps open but then show a white screen. The Maps and Camera apps work without problems. The live tiles on the Start screen are updating correctly, for example the Mail app's tile shows a summary of new mail despite the Mail app's problems. All of these applications were working correctly a few days ago. I'm sure I've used several without problems since the last Windows update occurred on 7th November. Any suggestions on what might have happened and/or how to fix it would be very welcome. I don't need these Windows Store applications, but the fact that they're not working is irritating me.

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• The BitLocker encrypted logical drive of my laptop is not accessible. On clicking error appears,"Application not found"

  - by Nauman Khan

  I had an important personal data that was stored in my laptop drive 'F'. My 4 year old son also uses my laptop to play games. To secure my data I used bitlocker software that was already there in my windows 7 ultimate 32 bit. I am using a Dell D 630 Core2Duo laptop. The thing worked fine for me and I have been able to access my data in drive 'F' as and when I required. But today, when I tried to open my 'F' drive, an error box appeared saying "Application not found". I right clicked and checked 'properties' of 'F' drive. It showed me Used Space = 0 bytes and Free Space = 0 bytes. I opened 'Disk Management' which showed my 'F' drive file system as 'Unknown (Bitlocker Encrypted). 'Disk Management' is also showing my 'F' drive as healthy logical drive. I opened 'Manage bitlocker' and found that my 'F' drive was being shown locked and 'Unlock Drive' was displayed against it, however, when i click on 'Unlock Drive', it does not function. I opened 'TPM Administration' and found an information that 'Compatible TPM cannot be found'. My bitlocker encryption was working fine which means that I had a compatible TPM in my laptop. Where has it gone? How can I enable it? Is my 'F' Drive lost forever and thus the data in there as well?

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• Can a non-redundant RAID5 cause any serious problems (compared to RAID0)?

  - by leemes

  I used to have a three-disc RAID5 (mdadm) in my computer for personal media storage (music, videos, photos, programs, games, ...). It had three discs with 750 GB each, resulting in an array capacity of 1.5 TB. One day (one year ago), I needed one of those discs to install another operating system. I thought, I don't need the redundancy anymore since I backup the most important stuff (personal photos e.g.) on an external disc anyway. So I decided to remove one of the three discs without converting the RAID to RAID0 or even two separate discs, because I had no temporary storage (since one cannot simply convert the RAID5 to RAID0 AFAIK). So now, for about one year, I have a non-redundant RAID5 with 2 of 3 discs running. Sometimes, one of the discs has a defective contact at the power cable or something similar causing the drive to stop working temporarily (I don't know exactly what it is). Since it still works when rebooting the computer and in most cases by calling some mdadm commands, it wasn't that problematic. Note that the data is not very critical, since I still have a backup of the most important stuff. But in the last few weeks, one of the drives fails very frequently (every few hours), so it gets really annoying to manage this. My questions are: Is there any disadvantage (apart from the annoying management) of a non-redundant RAID5 (with one drive less than typical) over a RAID0? If I understand it correctly, both have no redundancy and the same capacity. On a temporary drive failure, I can restart the array in both cases, assuming that the drive itself still works after the failure. Can it happen that the drive contents alter on a drive failure, making the array inconsistent? If so, can I tell mdadm to check the array for failures (without a file system level checking tool)? Since the drive most probably only has a defective contact causing it to fail for a second only, can I tell mdadm to automatically restart the array, so I will not even notice the failure if no application wanted to access the file system during the failure?

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• Computer slow after installing 32GB RAM

  - by John Gilmore

  I'm currently running very large network simulations for my PhD research, for which I need lots of RAM. I have a Core i7 2600K processor with a Gigabyte GA-Z68AP-D3 motherboard, running Windows 7 professional 64bit. I bought the system with 8GB (2x4GB) DDR3 1600 MHz Corsair Vengeance RAM and the system ran like a dream. I'm planning to upscale my simulations so I removed the 2x4GB RAM and installed 4x8GB DDR 1600 MHz Corsair Vengeance RAM. When I rebooted the system, boot time was much longer than usual (10 mins just to get to login screen). After logging in, the whole system was unresponsive. I tried playing some games (Bioshock 2), but it was unplayable. I've not had this problem before and I have an ATI Radeon HD 5850 graphics card, so that's not the problem. The only thing that's changed is the RAM. I've looked through the specifications of Windows, my motherboard and my CPU and they all state that 32GB of RAM is supported. Does anyone have an idea of what's going on? Any help would be greatly appreciated.

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