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• Computer won't stay powered up

  - by Android

  I have just tried to turn my PC on this morning and it won't stay powered up. It will come on as normal for about 5 seconds, not quite long enough for the monitor to wake up. Then it will power off. After about 2 seconds it will start again, it will continue like this until I pull out the plug. Plugging it in again doesn't restart the cycle although pressing the power button does. I have tried to clear the cmos but beyond that I have no ideas. It was working perfectly when I put it in hibernate last night. NOTE: I am using a Dell Optiplex 755 UPDATE 1: I took out the motherboard battery and it almost came on then it displays the message Error loading Operating System UPDATE 2: After taking out the custom video card, it says "No hard drive present"

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• No SATA drives after PSU Upgrade

  - by hauptbenutzer

  I know this sounds a lot like this but I just confirmed that my MBR is fine as well as the SSD drive in question. What happened: I upgraded my be-quiet 700w PSU to the 1000w dark power pro. When I tried booting the system and none of the drives (all SATA) were detected, resulting in the "Boot device failure" error. After that I unplugged all but the boot drive, triple checked that all cables were in fact nice and tight inside their sockets, replaced both e-SATA and power cables ; still with the same outcome. Finally I reconnected my old PSU and sure enough the PC booted without any hassle (except of course for the direful construction that is currently occupying my desk). Does anybody have any advice on how to proceed? Surely, it is possible the PSU is faulty but are there other explanations? Thanks in advance PS. if of any help: Motherboard is GIGABYTE GA-PH67A-UD3-B3 H67 LGA 1155

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• Prolog, check if term is power of 2

  - by Riku

  i have written following code, which should work with my logic, but it does not. I should check if given term is power of two. For example s(s(s(nul))) should return false, s(s(s(s(nul))) should return true. substractWhileY(X,0,rezult). substractWhileY(s(X),Y,rezult):- Y > 0, number is 1, substractWhileY(X,Y - number, rezult). degreeOftwo(X):- substractWhileY(X,2,rezult), pagalba(X, 2, rezult). calculateAnswer(X, currentCounter, currentValue):- currentCounter is currentCounter * 2, substractWhileY(currentValue, currentCounter , rezult), rezult\= null, calculateAnswer(X, currentCounter , rezult). My idea was to check if given therm is degree of any two and if it is not than it is not the degree of two. With numbers it should work like this. For example i give number 8. First time it checks if 8 - 2 = 0. second time if 8 - 4 = 0. third time if 8 - 8 = 0. so the 8 id power of two. Maybe other solution would work better, so thanks for any help.

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• What could possibly cause my computer to power down at random times?

  - by geoffreydv

  I have recently bought a new Power Supply and a new graphics card. My PC ran smoothly for a few months now but since a couple of days I'm having a strange problem. I am trying to isolate the problem to a specific piece of hardware (because if it's either the Power Supply or the Graphics card they are still under warranty). The problem started when I was playing a game (diablo 3). My PC suddenly powered down. I was unable to turn it on again by pressing the power button. I unplugged the power cable for a few seconds and plugged it back in. This time the pc powered on but the indication light turned orange instead of white as it normally does. The fans were not spinning and I did not see anything on my screen. After trying a couple of times I gave up. Two days later I tried again and this time the PC did boot up as usual. Everything looked okay until I tested if the problem was resolved by starting Diablo again. After about two minutes it powered down again as it did the first time. If I don't run any games my PC does power down after about 3-5 hours. Another fact that might be relevant: One time the PC did not shut down immediatly, instead first my graphics "powered down" but the music I was playing kept on playing. After about 20 seconds the pc powered down completely as usual. What I also noticed is that when I boot instantly after a power down, the chance of another power down occuring is much higher. Does anyone have an idea what could be causing this kind of behaviour or has a certain tool to diagnose the specific hardware parts? Thanks Specs: Memory: 6GB Processor: Intel i5 OS: Windows 7 64 bit The PC is a Dell Studio XPS 8100 with a replaced PSU and Graphics card: PSU: Corsair CX500 (500 watt) Graphics card: AMD Radeon 6850

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• Trouble reinstalling Gem after power failure

  - by Sirupsen

  Yesterday I tried to install Jeweler via Rubygems, however somewhere in the middle of the process I had a power failure, resulting in my computer turning off in the middle of the installation process. Once I got it back up, I tried to reinstall Jeweler, however resulting in an error I've had trouble decoding. Does anyone have any idea on how to fix this problem? (I tried uninstall, cleanup and check)

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• android and power point

  - by shriya

  I want to play power point presenetaions on android. basically when user cliks on button , play ppt file. How to do that? any example?

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• Power function fit to data set

  - by czerasz

  I have a set of data (in ArrayCollection) and I need to fit a power function { f(x)= B + x^alpha } to it, before display in LineChart. As result I need the alpha and B paremeter. How to do this with Flex?

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• DataColumn.Expression Power

  - by Graham

  the following code Dim dc = New DataColumn(name, GetType(Double), "[col1] ^ [col2]") produces the following error: The expression contains unsupported operator '^'. Is this right, is the power operand not support in datacolumn expressions??? Anyone have an idea how i'd write this?

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• Dedicating all processor power to a task

  - by Yktula

  Let's say we have a very processor-intensive task at hand which could be effectively parallelized. How can we dedicate all or almost all available processor power to performing that task? The task could be a variety of things, and iterative Fibonacci number generation that saves recorded numbers would be just one example.

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• Distinguish between screen timeout and power-button-press?

  - by Nick

  Hi, my app does something when the screen goes black, but I want it to only carry out that task if the screen was turned off "by itself", through a screen timeout - NOT when the user presses the power-button. Is there any way to distinguish between those two events? ACTION_SCREEN_OFF obviously fires in both cases, and I haven't found any other intents that might match what I'm looking for. Thanks for your help, Nick

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• connecting power point and excel

  - by silverkid

  how to connect power point and excel such that each slide in the powerpoint slideshow shows next excel cell in the cell in column A of excel.

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• Fastest way to find the largest power of 10 smaller than x

  - by peoro

  Is there any fast way to find the largest power of 10 smaller than a given number? I'm using this algorithm, at the moment, but something inside myself dies anytime I see it: 10**( int( math.log10(x) ) ) # python pow( 10, (int) log10(x) ) // C I could implement simple log10 and pow functions for my problems with one loop each, but still I'm wondering if there is some bit magic for decimal numbers.

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• Network corruption - corrupt downloads, corrupt streams, etc.

  - by rfrankel

  I've been having some problems with my home LAN. Downloaded executables won't run, my remote desktop sessions keep getting interrupted due to encryption errors, flash video streams show visible corruption (both Hulu and YouTube), and I've had a couple downloads for which the md5 hashes don't match. The problem has even occurred with a couple images embedded in webpages, though that's rare enough (presumably because images are relatively smaller files). I've had this problem across two Windows machines and a Mac, so it's neither machine-specific nor at the app or OS level. Comcast claims it's nothing to do with them, and my Linksys/Cisco RV016 router is out of warranty, so I have no access to official support. When I log into my router, it shows no error packets or dropped packets received. I plugged a laptop directly into the router and was able to download a 5.5 MB file and verify its MD5 hash, which is not proof that the problem is downstream of the router, but makes it seem quite likely, since I failed to download the same file several times from two desktops (one Mac, one Windows). Could this be a wiring problem? If so, is there any way clever/elegant to determine which wiring is faulty with just software? If I can avoid tracing all the wires throughout my entire house it would make my life quite a bit easier.

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• Packet drop measured by ethtool, tcpdump and ifconfig

  - by Rayne

  Hi all, I have a question regarding packet drops. I am running a test to determine when packet drops occur. I'm using a Spirent TestCenter through a switch (necessary to aggregate Ethernet traffic from 5 ports to one optical link) to a server using a Myricom card. While running my test, if the input rate is below a certain value, ethtool does not report any drop (except dropped_multicast_filtered which is incrementing at a very slow rate). However, tcpdump reports X number of packets "dropped by kernel". Then if I increase the input rate, ethtool reports drops but "ifconfig eth2" does not. In fact, ifconfig doesn't seem to report any packet drops at all. Do they all measure packet drops at different "levels", i.e. ethtool at the NIC level, tcpdump at the kernel level etc? And am I right to say that in the journey of an incoming packet, the NIC level is the "so-called" first level, then the kernel, then the user application? So any packet drop is likely to happen first at the NIC, then the kernel, then the user application? So if there is no packet drop at the NIC, but packet drop at the kernel, then the bottleneck is not at the NIC? Thank you. Regards, Rayne

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• Laptop Tracking System

  - by Guy Thomas

  Is there any software / hardware to track a laptop? Could you put something in your laptop that would identify it's location if a thief turned it on and connected to the internet?

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• Home ADSL Modem Dropping Packets?

  - by Cody

  I know this is supposed to be a "pro" forum, but I'm hoping someone can help since my ISP isn't doing much to try and fix things. My ISP has given me a DSL modem / Router combo - a ADB / Pirelli P.DG A2100N and I have a 4096 / 767 kbps connection. I use it purely as modem and router, and have the wireless AP feature turned off. I run it to a Ubiquiti Networks Toughswitch and use a Ubiquiti UAP as the wireless access point - although I've ran tests directly wired to the router with nothing else connected, and still see the same issues. I've been having issues where latency suddenly spikes from 8ms to google.com to 250+ if someone does anything on the internet. If I run a speedtest or something, I can see latencies above 3000ms. Regularly when downloading something, even if the speed is throttled to , it can get random drops to 0kbps every few seconds. Online gaming is impossible because I notice the sudden lag-outs in the connection, and video streams or VoIP drop out as well - it's not at all consistent. I managed to find the password to my modem and I don't think I see anything wrong with the settings - but I looked for the logs and found this: Jun 6 17:10:30 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:10:30 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:10:31 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:10:40 user warn kernel: __ratelimit: 63 callbacks suppressed Jun 6 17:10:40 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:10:40 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:10:40 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:10:40 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:10:40 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:10:40 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:11:22 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:11:23 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:11:24 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:11:24 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:11:24 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:11:24 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:11:24 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:11:25 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:11:25 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:11:25 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:11:29 user warn kernel: __ratelimit: 15 callbacks suppressed Jun 6 17:11:29 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:11:29 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:11:30 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:11:30 user warn kernel: nf_conntrack: table full, dropping packet. Jun 6 17:55:26 user warn kernel: bcmxtmcfg: OAM loopback response not received on VCC 1.1.3 Jun 6 17:55:27 user warn kernel: bcmxtmcfg: OAM loopback response not received on VCC 1.1.4 So, as I understand it, it appears the router is dropping packets? If that's the case, is there anything in the config that I can change? Or should I buy a new router, a new modem, or both?

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• Suddenly blocked from a site

  - by Diego Romero

  Suddenly from a time to now I haven't been able to go to a site I used to go frequently for maintenance (Wordpress). I tried different browsers, restarting my laptop, clearing cache, history, cookies. Also did a ping to the site ip, go 4 packets send and 4 lost. This is a problem I think with only my laptop, since I've been able to go into the site from other devices in the same network. I have also tried connecting to the same site from a completely different network with the same problem. I really don't know what to do about this, any advices? PS: site hosted in wp engine if that has anything to do with this problem.

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• Are there any disadvantages of having a "free fall sensor" on a hard disk drive?

  - by therobyouknow

  This is a general question that came out of a specific comparison between the Western Digital Scorpio WD3200BEKT and Western Digital Scorpio WD3200BJKT (which is the same as the former but with a free fall sensor.) Note: I'm not asking for a review or appraisal of these specific drives, as the general question does apply on other brands as well. Though your input would help my decision. To break down the general question in order to answer it, I would be looking for comments on things like: if it's necessary to have differing physical dimensions between free fall sensor drives and those without, e.g. does it make it any thicker, and therefore reduce the systems where it can be installed - particularly smaller laptops? does it actually make the system less reliable - because of false alarms whereby the drive thought the laptop was falling but it wasn't? I suppose that the fact that a manufacturer produces both drives with and without free fall sensors says something about possible disadvantages. Or it could be standard marketing techniques where by making drives with and without results in larger sales volume than just those with the feature alone.

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• Does a bad Internet connection increase bandwidth usage?

  - by Synetech

  My (Rogers) cable connection has been pretty bad recently (channels 3 and 10 are particularly fuzzy—it’s analog, not digital cable). Not surprisingly, this has caused my cable modem to drop out and have to reestablish a connection a couple of times since it started. The poor connection of course means higher corruption (not necessarily dropped per se) which causes the TCP/IP stack to have to retransmit packets more often. Reduction of bandwidth throughput aside, I got to wondering if it increases the actual bandwidth usage. That is, if there is a high error rate on the line causing packets to have to be retransmitted: Does this increase a bandwidth monitoring program’s numbers? Does the ISP count the retransmitted packets toward the monthly cap? Based on what I remember from my university networking courses and common sense, I have a feeling that the answer to both questions is yes, but I cannot reliably measure the first, and have no authoritative answer for the second. I’m wondering if maybe the retransmitted packets are acknowledged as being duplicates and thus not counted somewhere along the line.

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• LVM vs RAID0 vs RAID "linear" - Combine 2 disks as one, data recovery?

  - by leto

  Hi there, given two 2TB USB external disks that have to be combined to one 4TB volume and formatted with one big Filesystem (XFS), I have a small question to ask. Does LVM provide better Data recovery, should one disk be unplugged/damaged by being able to recover the data of the still working disk or is everything lost? I would appreciate a solution where only the data of one disk is lost and I can recover the content of the other with the usual filesystem/lvm/raid tools. Is that possible with LVM or RAID "linear"? This is for storing unimportant files that can be retrieved from backup, but I want to save time :) Thank you in advance

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• Entire folders deleted from My Documents periodically with remote logins

  - by darron

  I've got a customer who thinks our application is constantly deleting all it's data. It's really becoming a major problem for them. The problem is, there's no way it's us. They are losing not only our entire data folder (which we locate in the user's "My Documents" folder to make it easy to find), but some local settings files which are in entirely different places within the general user profile. It REALLY looks like the entire user is either getting reset, or is somehow synchronizing with a more... blank profile somewhere else. They're running this on some kind of virtualized Citrix guest OS. I see references to a "group policy folder redirection" that could do this... maybe roaming profiles? Any ideas? Help!

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• Computer loses all installed programs and appears to return OS-only state

  - by Jake

  This is a story regarding 3 laptops of different brand and models. On separate occassions, I configured each of these Windows 7 / Vista computers with the necessary configuration and applications (which are supposedly the same actually), e.g. join office domain, same windows updates, microft office etc. These machinese were configure in our office in Singapore, and then they were taken to India for use. Someday in India, when booting up the laptop, all went fine except when it reach the log in screen, it was no longer possible to login with domain credentials. Logging into the laptop local admin account will lead to discover that the machine has returned to "OS-only state". All the configurations and applications were gone. The actual user profiles are still in the C: drive so files can still be retrieved, but under Control Panel Uninstall Programs it is evident that at least the registry is corrupted. The above scenario happen to the first 2 laptops. For the third, the system reports "Operating System Not Found" on boot up. I cannot think of any reason except to suspect a power fluctuation issue. Question is, will a power issue create this behaviour? What else can cause this issue?

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• Are These Parts compatible?

  - by ell

  I have never assembled a PC before, although I have taken an old one apart and replaced a few parts in others here and there so I have (very) limited experience. I have been looking to make a pc and here are the parts I might buy: Foxconn P45AL Intel P45 (Socket 775) DDR2 Motherboard (with onboard sound I believe) Gigabyte GeForce GTX 460 OC 768MB GDDR5 PCI-Express Graphics Card Already have 2 1gb sticks of dual channel DDR2 memory Intel Core 2 Quad Q8400 LGA775 'Yorkfield' 2.66GHz 4MB-cache Processor Samsung SpinPoint F3 1TB SATA-II 32MB Cache Hard Drive Antec Dark Fleet Series DF10 Gaming Enclosure – Black I already have monitor, mouse, keyboard and DVD/CD drive Akasa Freedom Power 1000W Modular Power Supply I have never done this before so feel free to laugh at me for getting something obvious wrong, forgetting a vital component etc. but is all of this compatible? And have I gone overkill on the PSU, if so, please recommend one. Thanks in advance, ell. EDIT: Added PSU which I forgot to mention EDIT: I would be using this to surf the internet, write e-mails, chat, word process, play games such as team fortress 2 & spring rts (at highest graphics hopefully), some 3d modelling in blender, some opengl programming, and image editing in GIMP.

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• Computer sponteously reboots when doing heavy file copy to/from disk

  - by Mark Hosang

  I've been fighting with this problem for the last 3 weeks where my machine will just instantly reboot. No BSOD, and when i checked the event log all that was reported was the generic "Kernal-power" error with the detailed information pointing to a hard crash. This is a machine that was working for 18 months before these crashes started happening. When they started happening is after I added 3 HDs in a RAID-5, upped the memory to 12gb, moved to a new house, added a SSD and added about 5 case fans. I have thus eliminated the RAID, and determined that the SSD was not the cause (because it was still crashing even though the ssd wasn't connected). I've run memtest several times over night with no memory problems showing up. I've run IntelBurnTest to max out the cpu to see if it was a heat issue and at full tilt after 20 min it was only at 85C and the machine didn't crash. I also took a look at the voltages during this test, with a screenshot at the bottom of this post I've ruled out a software issue by reinstalling windows 7 ultimate x64 a total of 5 times, but even during that the install it crashes. Happens sometime during file copying at the beginning, or during uncompressing files, or sometimes during running windows update. The only discernible pattern i can see is that it seems to crash when hard disks might be spinning up or when they are accessed heavily from large file transfers. My current guess is that it is probably an issue with the MB, PSU or the power coming through the outlet. Any suggestions of what i could try to troubleshoot or what may be wrong? Specs PSU: Seasonic M12 700w Mem: 12gb CPU: i7-920 with stock heatsink MB: Asus P6T HDs: 3 green WD and 1 Corsair force 3 120b with 1.3.3 firmware Running full tilt voltages Idling Voltages

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• Windows 7 hangs after going into sleep a second time

  - by Brian Stephenson

  I've searched everywhere around Google and can't figure out why this is happening so I decide to ask here to see if anyone has a problem like this. Like it says in the title, whenever I sleep ONCE I'm able to wake the system, but going back to sleep again AFTER waking up for the first time results in it hanging on no input and no output, with the fan spinning as fast as possible and alot of heat being spewed out by the fan as well. I've tried various things like setting all USB Hub Root's to not get switched off for power saving, disabling USB selective suspend, disabling PCI-e link state power management, and even unplugging ALL USB devices and it wont wake up after the second attempt. And I've even waited up to a full hour of the CPU fan spinning loudly and it's still stuck trying to wake up. The only USB devices I use are a Microsoft USB Comfort Curve Keyboard 2000 (IntelliType Pro) and a generic HID compliant mouse from Creative model number OMC90S "CREATIVE MOUSE OPTICAL LITE". My other devices like external drives and controllers are unplugged when I'm not using them as having too many USB devices plugged in at a time causes a deadlock on almost all of the ports I have. Here's my system specifications (Most of these are from CPU-Z): Brand: Gateway DX4300-19 Mainboard: Gateway RS780 Chipset: AMD 780G Rev 00 Southbridge: AMD SB700 Rev 00 LPCIO: ITE IT8718 BIOS: American Megatrends Inc. ver P01-A4 09/15/2009 CPU: AMD Phenom II X4 810 at 2.60 GHz RAM: 8.0 GB DDR2 Dual Channel Ganged Mode at 400 MHz GPU: ATI Radeon HD3200 Graphics Intergrated - RS780 OS: Windows 7 Home Premium x64 OEM (Acer Group) HDD: WDC WD10EADS-22M2B0 1.0 TB (Western Digital Green Caviar) My BIOS has absolutely no control over how I setup the sleep mode to be either S1 or S3. So I can't check these settings or even change them. Hybrid sleep is also disabled, I can successfully go into hibernation and wake from hibernation but this is painfully slow due to a harddrive problem I'm having with this "Green Drive". (Hibernation takes over ~3 minutes to complete) Any help would be appreciated, thanks.

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