You have to suspect overheating. The CPU has a fan attached to it directly,
and some heat paste is supposed to be on there between the heat sink for the
fan, and the CPU. It's likely that connection is loose. If you need to
protect your warrantee by not opening the case, you should contact the
maker.
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Mark L. Ferguson
..
"Oogabob" <> wrote in message
news:3EFB0D96-801F-45D7-9183-...
> I am using Vista Ultimate and am on a fairly new computer, does anyone
> know
> what is causing this? I've ruled out overheating and energy problems. I
> set windows to not automatically restart and give me a blue screen on
> crashing, but it still shuts down and restarts with no warning.
>
> Is this a hardware issue? It's done this since I've gotten the computer
> but
> it seems to be getting worse now.