I recently bought two AMD Radeon HD6950 cards, both of witch I have tested and work alone, however when I try to crossfire them (or even just run both at the same time unbridged), my pc refuses to boot. The pc will run the fans, the cards will cycle between active and resting fan speeds, but nothing on the screen and no peripheral lights. No bios beeps
I've tried switching them around to make sure the PCI-E slots weren't damaged (they're all good), made sure the cards were seated properly, chekced the bios for hindering settings.
Mobo: Crosshair V Forumula-Z
CPU: AMD 8120 8 Core
PSU: 900w Antec (http://www.newegg.com/Product/Product.aspx?Item=N82E16817371050)