I have had 3 CPU's die on me in the last month.
I have replaced everything but the ram and the case.
I am using a core 2 e6300 and here is what happens.
I would come into the room and notice the power was off on the system.
Previously it was on. Then it never powers up again. (No fans...)
It is definately a dead cpu since I replaced it with a cheap celeron cpu and it powers up again.
I have used 2 motherboards
an Asus P5L-VM 1394 and a Gigabyte GA-965GM-S2
I am really thinking it might be a cheap multi-card reader that I plug into the motherboard. My guess is that it shorts out when it is commanded to sleep. (or just shorts out after a while).
Temps don't seem to be an issue as it was idle at about 29 and loaded at 52
The only thing I can think of is that one of the usb, audio or card reader(USB) connections to the motherboard is killing the CPU when it goes to sleep.
I have use 2 different ones.
One was a cheapo one and then the other was an antec trio 550W.
I ran the cheapo one for about 3 months and then I
put a 8800GTS inside and tried a tiny overclock and
then within a week it died.
So I put in a new power supply removed the 8800 and put
in a cheap test celeron cpu. Lasted about a week and then
I replaced the motherboard with a different brand and got the
replacement e6300 from Intel over clocked it a bit and it was
working fine for 1 day. I was able to crunch 4 videos at the
same time and the temp only got up to 52 C.
Do you think both power supplies might be involved??