Check to ensure the motherboard is not touching anything like metal ends,
the case wall, etc... The slightest contact can cause a short and result in
what you described.
Try swapping the video card out for another one just to see. If the problem
ceases after swapping the video card I would not be surprised.
Lastly, might be a good time for a nice cleaning. Open the case, remove
everything, clean everything off, including the fans (all of the case fans,
processor fans, etc).
If none of the above work, strip the machine down to just the video card,
motherboard, ram, processor, NO HARD DRIVE. Boot it up.. You will get a nice
BIOS message, "NO FIXED DISK PRESENT" or something similar. Let the machine
sit. If it shuts off like you described then you know it is either the
motherboard, ram, or processor. Try swapping out the RAM, then the
motherboard (processors have never gone bad on me when I am not overclocking
them).
I just had my ABIT AT7-MAX2 motherboard replaced because the same crap was
happening to me.. After a nice lightening storm that is :-)
HTH,
Mike
PS--> turn the heat warning alert on in the BIOS that will alert you when
the CPU gets too hot. Also, make sure that the option to turn off the PC
when the CPU gets to hot is not enabled!! *not all BIOS support the alert
and monitoring stuff.
> A good friend of mine is having a problem with his computer
> shutting down for now reason. We thought it may be over
> heating but that wasn't it.
>
> The only real symptoms would be that it will start up win xp
> and run for a while and then shut down. No error messages or
> warnings. Just a black screen and a restart.
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