Box refuses to power after video card swap

[APE992]

Specs:

A8N-SLI Deluxe
3700+ San Diego
x850xt by Sapphire
1.5gb of Kingston
500w Antec SmartPower
2x120gb Western Digital Pata
1x320gb Western Digital Sata
Dual optical

I swapped in a PNY 7900gt to test for a friend along with a 300gb Sata Seagate with molex adapter. Now it refuses to power on.

The PSU is fine as it comes on with green+ground jump along with the hdds and opticals. The mobos green light is on indicating it is getting power. The switch won't power it nor will a screw driver to the pins.

What I haven't tried:

Cmos reset
Reseating of all cables (did the main power cable already to test PSU)
Smash it with a hammer

Any ideas? If the mobo was taken out I might be able to get newegg to RMA it for a replacement since I got it in March and they offer a full year to replace anything.

 

[Bobthelost]

Is it failing to boot with the orriginal setup?

Unplug everything and leave it overnight. I thought i'd blown my CPU once upon a time, left it for a few days while i cried and then did a final test before taking a sledge hammer to it. Glad i waited now

 

[DaveSimmons]

Does it power on with no video card attached? It should power up with a beeeep code.

Did you try detaching power cables, starting with the new SATA drive? If necessary work your way down to having just the motherboard attached to the PSU.

 

[APE992]

It doesn't power on at all. Nothing, no beeps, no lights. It might as well not have a power cable. Right now theres nothing but the atx power line and additional 4 pin connector (atx=20+4 pin then seperate 4 pin) for power. Doesn't do a thing.