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• How is time measured in computer systems?

  - by DRK3

  Something I have been puzzled about is this: how exactly does a computer regulate and tell time? For example: if I were to write a program that did this: Do 2+2 then wait 5 seconds How does the processor know what "5 seconds" is? How is time measured in computer systems? Is there a specific chip for that sole purpose? How does it work? Thanks for any replies; I'm really interested in computer science, and would love any help you could give me =D.

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• where to look for computer technician jobs

  - by Kareem

  Hi I am currently studying for the A+ certification, I plan to have it by the end of this month and I plan to go for farther education. I’ve built two high end computers by myself for a friend and family member. Install OS and everything. I’m looking in to finding either a computer assembly or computer technician job . Where is the best place to look for one? I’ve looked in to best buy but I find their geek squad to be a little bit shady. Where is a good place to look for a full time entry level computer technician job just starting out in Tampa, FL?

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• Connect to virtual host computer from within virtualbox

  - by Nicky De Maeyer

  I'm currently developing on an ubuntu karmic. For this I've installed lampp with a virtual host on apache so http://myproject/ is mapped to my project's root directory. Now to test the website in IE I've installed an XP machine on a virtualBox OSE. Ive managed to get the virtual host working on the XP by adding its to the hostfile, like this: 255.255.255.255 myproject where 255.255.255.255 is the ip adress of the host computer (my ubuntu). Now every day when I come to work and plug in my computer to the network, my IP has changed. so When i boot the XP I have to change the IP in the hostfile to my new IP. Is there any way where I can set the ip to somthing the XP will recognise as the host machine? I've tried replacing the IP in the hostfile by the host computer name, but that does not seem to work... This would make my like a bit easier :)

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• Computer becomes very slow (permanently) after running a bunch of apps

  - by djzmo

  Hello there, My computer with Windows XP installed becomes very slow after I ran some heavy tasks at a time. (play a full 3D online game while extracting a 4GB RAR archive) It freezes for about 200~500ms every few seconds, and this always happens if I do heavy tasks at once in my computer (for example, installing a program while playing games), and the lag remains permanently (even a reboot won't make it better) unless I repair-install the Windows. Since I have a low-end computer: Intel(R) Pentium(R) 4 CPU 2.00 GHz, 512 MB of RAM ATI RADEON 9550 AGP 256 MB And the only way I used everytime to fix this problem is by repair-installing my Windows XP. So that I won't lose any data or installed programs. But I believe there's a better and faster way to fix this without repair-installing the Windows. Any idea?

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• My computer keeps crashing and I just want it FIXED

  - by xabaddon

  So long story short, I had my brother build me a computer for my birthday last year. I saw how good his was (also built by him) so I decided I would have him build me one. About a month after this was all finished, my computer started crashing when I when run over 3 programs. For example, an online game, a music player (spotify), skype, and a browser with a few tabs open. The way it would crash is the screen will freeze and a buzzing noise will come from whatever audio device I am using (headset, speakers) I took it to a computer tech guy and he told me my cooling system was inadequate. SOOO he led me to buy a CORSAIR H75 Liquid cooling system. Everything was good for about a week, and now it just did the same thing again. I am so freaking over this guys and I really need some help figuring out what the heck is wrong, I dont care how long it takes, just please help me.

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• Computer Flashes Out?

  - by GuyNoir

  We have a strange problem with our computers at my school. They are all Latitude 2100 Netbooks. At random points (I can't seem to find a pattern) the screen will turn a single color (red, green, black, brown, etc.) To fix this, the computer must be put to sleep, and brought back up. They have integrated graphics, but I can't imagine that if it was a bug with the computer itself, that every single computer would do this. Is there any way I could find out the problem that's causing this. Some diagnostic tool? Thanks. Edit: Forgot, they all have windows.

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• Access Other Computer via ADSL Modem and Router

  - by Sohail

  My network configuration is like this ISP - Modem - Router - Computer and the same goes for my friend. We want to share large files or to access each other's computer. The Passwords to login to the web page of each other modems are known. I mean, we can access each other Modem Web GUI easily ( because we know the WAN IP of each other modem ). The question is how do i access his or how do he access my computer? Is there any way to do so. Remote desktop connection is not working :( Please help

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• Put a Windows computer to sleep remotely (from a Linux box)

  - by snark

  I'd like to have my Linux box (a QNAP TS-210 NAS) send the order to go to sleep (or hibernation) to my main Windows 7 computer. As the NAS is running Linux, I can't use psshutdown from SysInternals' PsTools. Is there any Linux equivalent? Or some "magic packet" that can order the Win7 computer to sleep. I know I could install a SSH daemon and trigger a shutdown command from the Linux box using ssh, but ideally I do not want to install anything on the Win7 computer. I can install Linux software on the NAS, no problem about this. PHP, python and perl are also available on it.

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• Accessing the physical IP address of a computer on my network that is no longer available

  - by floebs

  I'm trying to find out how to access the IP address of a computer (macbook pro) that I once had on my network at home. Does terminal store the 'connected' or 'linked' computer ID or IP of a networked computer anywhere that I can access after the laptop is no-longer within range? The laptop was part of my airport extreme network, its now out of range (stolen!), and I would like to know if its possible to discover the physical address of that laptop, even though I no-longer have physical access to the laptop. I have my airport extreme configured (somewhere??) to sniff out that laptop if it comes within range, and then connect to it. Where would this 'configured info' be stored on my desktop?

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• How come I can't ping my home computer?

  - by bikefixxer

  I'm trying to set up a vpn into my home computer in order to access files from wherever. I have the home computer set up with a no-ip dynamic dns program so I can always connect, and have also tried using the actual ip address. However, when I try to connect or even ping from anywhere outside of my house I can't get through. I've tried putting that particular computer in the dmz, turned off the computers firewall and anti-virus, and I still don't get anything. I have comcast as my home internet provider. I have also tried from two different locations. Are there any other solutions I can try or is comcast the issue? I used to be able to do this when I ran a small web server at home for fun but now nothing works. Thanks in advance for any suggestions!

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• My computer keeps restart when accept Skype call

  - by hvtuananh

  I'm using latest Skype version (4.2) on Windows XP SP3 My computer keeps restart when I click "Accept" button on Skype call Windows Update is running and I've already installed all updates What's wrong with my computer? How to fix it? EDIT: I only see this error in Event Viewer Event Type: Error Event Source: System Error Event Category: (102) Event ID: 1003 Date: 3/2/2010 Time: 3:47:50 PM User: N/A Computer: TUANANH Description: Error code 1000000a, parameter1 ffffff94, parameter2 0000001c, parameter3 00000000, parameter4 80537bf1. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Data: 0000: 53 79 73 74 65 6d 20 45 System E 0008: 72 72 6f 72 20 20 45 72 rror Er 0010: 72 6f 72 20 63 6f 64 65 ror code 0018: 20 31 30 30 30 30 30 30 1000000 0020: 61 20 20 50 61 72 61 6d a Param 0028: 65 74 65 72 73 20 66 66 eters ff 0030: 66 66 66 66 39 34 2c 20 ffff94, 0038: 30 30 30 30 30 30 31 63 0000001c 0040: 2c 20 30 30 30 30 30 30 , 000000 0048: 30 30 2c 20 38 30 35 33 00, 8053 0050: 37 62 66 31 7bf1

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• Unable to connect to another computer from the Task Scheduler on Windows 7

  - by Clem

  I am getting the following error when trying to connect to another computer from the Task Scheduler on Windows 7: "The remote computer was not found." The computer that I am trying to connect to is definitely on the network as I can ping it and browse its shared folders in Windows Explorer. Note that I get the same error message when trying to perform the same operation from Performance Monitor. This suggests that I need to something to enable remote connection to the Task Scheduler. I am not very experienced with Windows administration and I am not sure where to look. To give a bit more context, I want to use the Task Scheduler to automatically start Perf Mon on a few machines at my company. I'd like to setup the Task Scheduler remotely. Does anyone know what I need to do?

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• What if a computer with Ethernet

  - by George Nixon

  I'm just revising for an exam on Networks and Data Communications, and there's one thing I don't get about CSMA/CD and Ethernet. It's supposed to be fairly stable, for instance if a computer drops out of the network, it's not a problem like it might be in a token ring network (I think). But Ethernet works by all the other computers waiting for the currently transmitting computer to finish what it's doing, and then the others use CMSA/CD to determine who goes next. What if one computer malfunctioned and kept sending a continuous stream of data in an infinite loop? In fact, is there a standard time for pcs to transmit before they yield to others?

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• wake-up by the computer

  - by doug

  Hi there some time ago(10 years back) I've read on PC Magazine that some mainboards have some settings which allow to a computer to open at a certain hour. I need to make my computer to wake me up in each morning. How can I do that ? What MB settings allow this feature? ps: i will like to shout down the computer during the night(not sleep or hibernate mode). ATM I'm using windows xp and 7 on my computers.

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• Creating a server of an xp computer?

  - by Sweppi

  Hey, I want to create a server for my website since what I'm going to have on the website is far more than I can store web hotel. So I have this xp computer I'd like to use as a server. I did have a guide of this but unfortunately the link broke. But what i understood was that I'd be in need of a windows 2000 disc for this to work. Do you have any good tutorials/guides about how I can remake my xp computer to a server? The computer is running windows xp home edition Service Pack 2 Thank you in advance!

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• Infected Win XP disk not openable on a Vista computer

  - by Retired57

  How can I read a WinXP partioned disk that is infected and shows up on a USB connection to Win Vista computer as a single partition that Vista cannot see the contents? The XP computer HDD is partioned into 4 partitions. It became infected, and all attempts to clean it have failed. Applications begin to launch, but are then shut down by the infecting agent. Using a major Anti-virus Co. boot disk (which was unable to connect to the Web, probably because the infecting agent stopped it) with virus definitions dated after the disk became infected, the resultant scan showed no infection. I bought a USB cable to connect the IDE drive to my Vista computer, but when I open Win Explorer, it sees the disk, but does not show any contents. It indicates it is a single partition that is valid. However in all the ways I have tried it does not show drive contents. Any suggestions on what to do next?

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• Firefox loses app tabs when I shut down my computer sometimes

  - by Xitcod13

  When I shut down my computer sometimes my app tabs do not reopen in Firefox and I need to remake all of them which is pretty annoying. I don't know if this is a common bug it might be specific to my computer. I run Vista x64 and it just seems to still have quite a bit of problems. Sometimes when I command it to shut down it does not simply showing shut down loading for hours so I need to manually turn it off. I think that might be messing up Firefox but I'm not sure. I also found a related thread on Bugzilla about this problem but I don't think it's the same issue as it only happens when I shut down my computer.

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• Computer Loses connection to router

  - by ajon

  I have a new Windows 8 Dell XPS desktop computer at work. It has a Dell Wireless 1703 802.11 b/g/n (2.4ghz) wireless adapter. sporadically throughout the day I lose internet connectivity. When I click on the wireless system tray icon, my companies router does not appear in the list. No other computer on the network is losing connection, only this one. I don't even know what to check. Could it be an ip conflict that causes me to get booted off? (I use DHCP), but why wouldn't my computer be able to see the network. The next time it happens I will see what happens when I try to access the router directly.

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• Can the onborad LAN cause computer shutdown

  - by user1146320

  I have P4 processor with nvidia card. Now if i don't connect to internet then my computer stays on for as much i can like 4-5 days. But if i plug in the ethernet wire. Do some surfing and leave computer as it is. Then computer fails. I mean The display on screen gets off Looks like something stopping the power supply to Harddisk. But motherboard stays on , FAN is still running , i can eject CD drive as well. But no display on monitor. I have to turn off and then turn on again. I tried formatting windows XP but again same problem

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• How to logon to a non-domain computer from one in a domain

  - by Svish

  I've met a rather annoying problem that should be very simple, but I can't seem to figure it out. I have a work laptop that is part of a domain, so my username is foobar\bob. I also have my home computer with no domain, just the username bob. I'm trying to connect to a share on my home computer from my work computer. It's asking me for my username and password, which is bob, but when I type in bob it assumes I mean foobar\bob, which of course doesn't work. I've tried to use hostname\bob, but that doesn't seem to work either... What can I do here? Both computers are running Windows 7.

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• Computer hangs on start-up, but re-start always works

  - by user10604

  I press the power switch; the fans start whirring; then precisely nothing happens. The monitor lights (I have two monitors) blink to indicate that they aren't receiving any signal - no BIOS splash screen, nothing. This scenario occurs about 80 percent of the time, the other 20 percent being normal starts. Noticing that the computer has not started properly, I press the power switch for four seconds to turn the computer off, and then I press it again to start the computer for the second time. It always starts normally the second time. Always. The power supply is a 750W from SilverStone. The motherboard is a Gigabyte P55A-UD3P. The video card is an Asus EN9800GT. There's 8 GB of RAM. I don't know what other information might be pertinent. Help!

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• Computer not booting, black screen, no beeps

  - by Michael Gaddass

  I bought a pre-owned computer on Ebay. It booted fine, had to reset due to it not detecting USB mouse, but it detected the USB keyboard. Booted fine again, then I tried to install Ubuntu Desktop, when it was installing I got a phone call, when I'm answering it, I find a Blue screen of Death. I reboot the computer and nothing, no BIOS boot, no beeping, but one of the fans was on. I opened the cover and found a large amount of dust, removed it, still not booting. I'm a complete novice with computer repairs, the most advanced thing I did was take a 286 harddrive and replace a 486's damaged harddrive with it (put the drive into the 486 that is), what could possibly be causing this?

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• Computer hanged in the middle of bios flashing process

  - by Stalker

  I have a laptop: Toshiba Satellite c660-17j, today I decided to update BIOS. I've downloaded bios updater from manufacturer's web site, and in the middle of flashing process computer hanged. I was waiting more than 30 minutes, but nothing was changed on the screen, i've tryed to PRESS MORE BUTTONS, but there were no reactions, so i've turned it off by removing battery (all other methods failed, even pressing power button for ~10 secs). After that computer can't start. I understand, that there's MESS in BIOS chip, and it's possible to re-flash it with hardware programmer, but I don't have it. I remember, that on some PCs (even on my eeepc) there was possibility to re-flash bios by inserting usb flash-disk (with .dat file on it, which contained BIOS), and power on PC, while holding some keys combination, then PC was switching to BIOS programming mode and re-flashed BIOS, after that it was possible to boot up normaly. Is there a way to recover computer without hardware programming BIOS chip? p.s. sorry for my english.

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• Computer stopped working (ASUS P5GD1-VM)

  - by Gordonrjones

  My computer stopped working the other day. I came down and it was kind of chirping away. Then, when I restarted it, it only did the same thing. I unplugged everything not needed and it did nothing at all. I thought maybe the power supply wasn't working, but when I took the cover off the green light on the motherboard was on and the power supply is making a little buzzing sound. But nothing happens when I turn the computer on, other than the green light on the motherboard flickers a bit. I checked the memory in other computer and it works fine. I'd love to be able to fix this with as little cost as possible. Can someone here help? P4-640 (3.2E GHz, 800 FSB, L2:2MB, EM64T, HT)

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• Tips for locating my stolen computer

  - by user379468

  I'm in a bit of a panic, my new Powerbook laptop was stolen. I had no mobile me, or security software installed on the computer. I have the mac address of the computer as well as the serial number. Is there a hacky way to do this? I was even thinking perhaps of trying to use bluetooth, I know I had it set to discoverable. and I know the "name" of the computer, perhaps there is app that can scan the names of bluetooh computers in the vicinity? If there some third party you can get to scan the internet for your mac address? Any glimmer of hope would really help

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