So for the past few months my PC has been resetting randomly and without warning.
I thought it was overheating, but the temp seems fine and it also resets while idling sometimes.
Sometime it resets at the BIOS screen before even booting up Windows. But here's the weird part - sometimes it doesn't reset for a week or two!
I've put my PC under various CPU and GPU stress tests. All I can say is that sometimes it does, sometimes it doesn't reset under those tests. I'm really stumped. I don't know if it's software or hardware related.

Specs are:
Win7 x64
C2D 6320
8800GTS
4gigs of ram
500W PSU
Asus P5B mobo.

Can anyone help?
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