Upgraded Power Supply, Now PC won't POST

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If that's the case, it sounds more like a PSU issue than anything else.
There's no reason for a certain Processor to inhibit a GPU to work, so it seems there's a power shortage.
 
Baffling. Check what are the power consumption specs for E6320 vs E8400. I would assume E8400 being a 45nm vs older 65nm E6320 is less power hungry. Both are 65W designs though. As a last test, try updating BIOS. It's just really weird, unless E8400 requires significantly higher amp rating on certain voltage, I see no reason whatsoever that PSU protection should kick in on three separate PSUs (if I'm reading your posts correctly). 65W is peanuts. If BIOS update doesn't work, I would go with redk's suggestion - try another PSU.
 
Thanks everyone for all the suggestions. I'm still trying to figure out the mystery of this E8400, but in the meantime, I just broke down and bought an E7400 which I overclocked to 4.03 GHz, making it faster than my old 8400 anyway.

If I find a solution, I will post it for the sake of completeness.
 
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