Computer shuts off a random.

June 12, 2010 at 17:26:47
Specs: Windows 7
My computer shuts off randomly. I have replaced the powersupply,ram and hard drive (had spares) Reinstalled windows. Temps are normal. All fans running normal. Problem persists.

Computer will work normal, can install programs, yet walk away to go to work or bed and computer will be shut down when I return. It is then 50-50 whether I can reboot. As I have reinstalled windows 7 I doubt it is a virus.
Computer is a homebuilt and has worked fine for 2 years.

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June 12, 2010 at 21:05:37
Are you sure the power supply is a good one?

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June 13, 2010 at 12:05:54
Yes, used in another computer for 2 days without problem both the old and new PSU.

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June 14, 2010 at 09:11:43
Check event viewer to see if there were any errors about the time shutdown occured.
Check temperatures with a utility to be sure there is no overheating.

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