This is strange. When you plug in this computer the fans start running and the hard drive spins. (The power button has not been pressed.) When you push the power button the rear case fan stops running. The computer never boots, but it does seem like the power supply is getting juice to all the devices.
Here's what I've done so far . . . the power supply has been replaced since that was the low hanging fruit. All of the cards, HD, and other connections have been pulled so those devices aren't interfering. Same result. At this point it looks like it's either the mobo or the cpu. I'm waiting for a replacement mobo tester in the mail, so in the meantime any probability it's one vs the other? This computer is less then 1 year old so neither of these parts should be an issue, but stranger things have happened.