No video output from motherboard/gpu. Gigabyte Z77MX-D3H

No video output on iGPU or GPU on Desktop. Motherboard not posting. GPU fan spins at 100%. I've tried removing all RAM sticks and tried each one by itself. I've removed all hard drives. I've reset GPU and tried without GPU. I feel like I've tried everything at this point. It's a new power supply. I've tried two other power supplies as well.

I can't get Dual BIOS to kick in, either (no switch on this board so I have to use the power cycling trick).

Gigabyte Z77MX-D3H
i7 3570k
AMD 6950 2GB
Silverstone 500W Strider PSU