A while back I would start my pc and it would work for around 2 mins until it would randomly die. It kept getting quicker and quicker, so I replaced the PSU from 700w to 780w. Didnt fix it. So i bought a new mobo from an Asus p5k deluxe to a new gigabyte ep45-ud3p. Still shutting down. I have vista 64 and I've only got to actual desktop once before it died. I have an Intel Quad Core CPU that might be the case. Any ideas? I've reset the cmos, checked cords, damn near everyhting ,but swaped CPU.
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Check your idle temps of your cpu in the bios while it is idle. If it is very high, say 60 to 75 c then it points to the fact your heat sink is not mounted right on top of your cpu heat spredder.