Unexpected Shutdown

I have a computer that powers itself off intermittenly.  It shuts down when I've been using it and walk away for a few minutes.  The shutdown may take place anywhere from 5 to 30 minutes after I've stopped using the pc.  I went into event viewer and found dozens of critical errors.  Can't remember the exact error message, but the "details" were something like "The computer had an unexpected shutdown, may be due to power loss, application error.........".  The error listings had "kernel-power" or "power-kernel" in the source column.  Is there any way to determine why the machine is powering itself off?
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By any chance your power scheme is set to "Turn off hard-disks" after certain time?... because this setting could cause some "freezing" of the system or some sudden restarts.
so while you are using it, its fine.  i.e. you could be at it for 4 hours and no problems, only when it sits idle for a bit?  Have you tried turning down the power settings to not put the computer to sleep after x number of minutes?
It would also help if you could post the error id, number, and the description.
cootermanAuthor Commented:
Correct.  It's fine until I walk away.  I did check power settings - computer is set to not sleep.  I'll try to get you a better info on the error
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install speedfan to check if it's not overheating : http://www.almico.com/speedfan.php
Sounds like power supply needs replacing

 Especially if it is not Blue screening
James MurrellProduct SpecialistCommented:
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