Hello,
I've got a strange problem. I bought my old/new PC:
AsRock P67 Pro3
i5 2550K
2x 4GB A-DATA 1600CL9
XFX PRO 550W

It's everything ok when I'm using my old GPU - HD5770 or GTS250, but if I try to use VTX3D HD7950 X-Edition Boost v2 it's calling D6 error "missing VGA". I've got 2 similar models of this card and both I checked in other PC and 100% working.

What I tried to do:
- update BIOS 3.1 => 3.3
- powered from MOLEX
- drivers (but it's obvious not working cause i cant see nothing including UEFI and POST screen).
- HDMI, DVI, D-SUB...

And now can someone tell me what is going on? Is it missing microcode in BIOS of motherboard or in GPU (it cant change mode from PCI-e 3.0 to 2.0?)? P67/CPU isnt compatible with PCIe 3.0 but i see even newer cards working on it. Or maybe CPU is broken? I dont have ane ideas what can i do with it. Can you help me?

PS. Sorry for my english :(

Thx for help :)