Rebooting Problem

About a month ago, I began having problems with my computer rebooting.  It was as if someone had just hit the reset button.  This doesn't appear to be an overheating problem, because it happens anywhere from 3 minutes after I get booted up, to more than an hour before it happens.  I installed a new power supply, and this did not help.  i thought I might have a virus, but have run 4 different virii checkers and found nothing.  To date, I have replaced all but the floppy drive and the CPU chip, an AMD Athlon 1200MHz, and the CD-RW drive.  There is another computer plugged in on the same circuit, so I am doubtful of line voltage problems.  Can a faulty CPU chip cause this rebooting?
Sarge75801Asked:
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Glen A.IT Project ManagerCommented:
You've replaced the board as well?
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chicagoanCommented:
Yes and the cpu is the likely culprit since you've replaced the power supply.
When memory goes bad the machine will generally crash.
The motherboard is the other candidate, and board level repairs aren't practical.
Have you been monitoring your CPU temperature, maybe you have a dying fan on your CPU cooler?
Aida and MBM can do this from the operating system on most boards if the CPU fan plugs into the motherboard rather than directly to the power supply. Some BIOS have a setting that will beep when the CPU temperature reaches a threshold you set.
You can try removing everything but your video card and disconnecting your IDE devices and running memtest86.
If you have more than one memory module, test them one at a time.
With an Athalon 2000 and motherboard bundles going for $100, it might be time to go shopping.
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jhanceCommented:
While a bad CPU may cause this a MUCH MORE LIKELY problem here (in my experience) is BAD RAM.

If you have multiple modules, try them one at a time and see if the problem moves with one module.

If not, try getting or borrowing another module and try it alone.

I'm guessing that you'll see that RAM is the problem.
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jhanceCommented:
By the way, the statement:

>When memory goes bad the machine will generally crash.

Is a gross generalization.  I would say that a correct version of this is:

"When memory goes bad the results are totally unpredictable."
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chicagoanCommented:
more of a 'sweeping generalization' but in my experience rebooting is not as common a side effect of flaky memory as a hot processor or bad VR's on a mobo.
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jhanceCommented:
My opinion vs. your opinion.  Hopefully we'll see shortly.
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