Are you /sure/ its a CPU issue? The PSU gets tested in POST too. Try putting the CPU into a different computer - it wont hurt the other computer, CPUs dont fry mobos. I'm suspecting that it is the PSU, CPUs don't frequently just up and die like that, and the PSU is almost always stressed. Either that or your just utterly dominated your mobo.
Thats exactly what I was thinking too, AMDs tend not to up and just die...*although Ive seen it happen due to overheating*
Looks like you have a bad mobo if the new PSU did the same thing.
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