Sounds like a bad video card to me. Take a good look at the card and see if any caps are bulging out. If you cant see any visible signs of damage the only real way to test it is to try the video card in another machine.
Okay, that's why I posted. Good idea! So I took out my hd4870 of my other pc and put the card I question in. It booted right up no problem. So then I moved the 4870 over and the other one booted up. Wth. Does the 4870 call for less power?
Okay. More update. Since the pc in question booted with the 4870 I decided to plug back in the rest of the USB, hard drives lights etc. No power to vid or USB again. (vid card fans are on but they were before too).
Edit update2: I restartes it again with the 4870 and it booted fine. 8800 back in, no go.
So either the psu isn't liking the video cars or the mobo hates it