PC lockup (usually when idol)

Hello,
My PC locks up about once every 2 weeks. It never locks up when I am
working on it, but I'll come into my office in the AM, and it will be
locked.
Doesn't respond to mouse or keystrokes.
I have it on all the time. I have run a RAM diagnostic utility from
Microsoft and
RAM checks out OK.
Things I have considered :
Overheating? (since I have it on all the time)

Video Card? When it locks up, whatever screen save I'm using is
usually
distorted.

Any advice appreciated!
thanks

.

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