hrm... i dont think it's your CPU. probably more like your mobo... take everything out, and rebuild just the barebowns system (cpu, ram, and vid card), and boot. if it works, throw in your harddrive and cd rom and boot again... reinstall windows again. then go from there.
you can test it with another powersupply, but i doubt that's it...
also, most motherboards have a sensor and will shutdown if the CPU fan isn't plugged in, or if the rpm's of the fan gets to low.
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