You missed out the most important piece of information, Your graphics
card!!! I think that maybe it's getting to hot and overheating, this
might be caused by either a broken fan or collected dust in its heat
sink.
Maybe the power supply though, have you recently put in any new parts?
Your power supply might not be able to handle the extra power
consumption.
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DOMINATOR
[image:
http://www.l33tsig.net/sig/1/DOMINATOR.png]
My Rig:
-E6550 2.33Ghz Core 2 Duo
-P35 DS3 mobo
-8800GTS 320MB GFX Card
-2GB 800Mhz RAM