Computer Restarts Itself

I've checked almost everything on my computer and nothing has gone bad. The only thing I haven't checked/replaced is the processor, which I will be doing within the next week and a half. It will run in the BIOS as long as I want it to, but during or shortly after windows startup it randomly restarts. It has a brand new mother board and power supply, and anything else has been tested using a seperate computer. I disabled the overheat restart, but it runs at about 50 deg. celsius. I disable the restart when error occurs option in windows, but I get no blue screen of death when it does restart. It used to happen at very lengthy intervals, perhaps once a week, but the time between restarts has been getting progressively shorter, and now it doesn't run for more than 15 minutes if windows starts at all. Windows tells me it is a hardware problem. Are these prblems indicative of a cpu failure? If not then what are your suggestions?

EDITOR'S NOTE: I'd suspect RAM or motherboard.

You May want to try updating your BIOS with the latest BIOS file. I just had this problem when installing a new Graphics card. I needed to update my BIOS as the harware was newer then my computer is. You can find the latest Bios update file from your PC manufacturer's web site.

Your knowledge base is helpful to me diagnosing some problems but i have still something to worry about. When i install audio driver on my PC, it reboots while reaching to the end of installation leaving installation incomplete and hence my pc without audio driver. Can you help? Thanking you in advance.

My computer restarts during heavily resource-demanding programs. I'm pretty sure it's not hardware, because I reformatted and reinstalled Windows XP, and it temporarily fixed it. Now its doing it again and I am starting to suspect Windows Update. Both before and after the reformat, this problem has seemed to occur shortly after a large amount of updating from Microsoft. Is it possible that Windows Update is the culprit? Thanks.

EDITOR'S NOTE: That doesn't seem likely to me. I'd rule out out overheating or bad ram before suspecting any software.

My computer restarts when: I Try to run a dvd from my dvd player or Play MMORPG's (often just a fem min's in the game. I hear a faint "click" before reboot, and sometimes the screen goes white, with ascii-like blocks, then computer reboot. I have unchecked automatic reboot, but still dont get any BSOD.

It first started when I was playing games like WoW and LOTRO, so then I figured it would be the graphics card, but since I found out trying to play a DVD also rebooted the computer, I aint that sure. Im more convinced of a bad power supply now. What do you think it may be? Im a little anxious to format my main drive since the DVD player seems to restart the system.

EDITOR'S NOTE: Unfortunately you have to do some trial and error testing. Start with the power supply, then the video card, and/or RAM...

I opened my computer for cleaning. After that it didnt start. I pressed ram, processor and it worked. But now it restarts rendomly. I removed heatsink cleaned. No improvment.
Initially it takes sometime to reboot. But after 1 hr or so it restarts very often. Even sometime I am in BIOS setting. I checked temp. seems ok. I noticed that when temp in the room is cold, it restarts very often.
Is it virus, component failure OR BIOS ?

EDITOR'S NOTE: My first guess would be component failure, probably RAM or power supply.

My PC restarts automatically even when I'm in BIOS setting. (Removed HDD,DVD drive, mouse, keyboard). Still it happens. if HDD connected sometime it goes into windows and stays for like 12 mins before restarting.

I took it to the motherboard test-support-center and he plugged it and it ran good for half hour and he returned it saying Motherboard is fine. I tried the PC at my office and it worked good for 3 hours, without any restarts.
I brought it to home ,and again it restarts at random intervals.

The only difference between my office setup and home setup is . (used same Mouse, KB at office and home) different LCD monitors, AirConditioning at office and nothing at home. Power. Any hints or suggestions for further debugging would be great.

EDITOR'S NOTE: Try swapping out the power supply.

my computer is restarting by its own when just power button is pressed, please help me. thank you

EDITOR'S NOTE: Isn't it supposed to do that?

I recently installed a new graphics card because my old one was dying. For some reason, my computer will run for about 30 seconds, just long enough for it to boot windows and get to desktop, and then it suddenly restarts to a black screen with text on it that lists my new video card's name and specs.

I uninstalled the old drivers before installing the new card. I'm running windows xp, and the old card I'm replacing was an ATI Radeon 9700 Pro, the new one is an NVIDIA Geforce fx 5200. Any suggestions?

EDITOR'S NOTE: I don't think this necessarily means that your video is/was at fault. Especially since you replaced the video card and the problem remains.

My computer runs fine except when I shut down it goes through the process and then restarts itsself. I just built it from a bare bones kit.

EDITOR'S NOTE: Failure to shutdown is usually related to a driver problem. It may not sound very helpful, but you might try installing updated drivers for each hardware component until you nail the problem.