MSI Z77A G45 not detecting Sapphire HD 7950 , only integrated graphic works

First of all - sorry for my poor english,
I've build my setup today.
MSI Z77A G45
i5 3570k with Macho Hr 02
Sapphire HD 7950 Vapor-X
2x4 GB Corsair Low Profile 1600
XFX Core 550W
The problem is MOBO is not dectecting my HD7950 Sapphire when connect to HD7950 HDMI out (using SONY Bravia as display) It works only with integrated graphic on MOBO hdmi out. I've installed Win7 64-bit. System boots fine but only on i5 graphic.
I'm using nearest CPU PCIe port. Unfortunately can't try plug HD7950 in with other PCIe port, Radeon won't fit in case I own (Fractal Core 3000 usb 3.0)
BIOS version 2.9
Need your help

Has the VGA been tested in another machine to verify it works? Do you have access to other VGA's you can test in the primary graphics PCI-E 16X33 slot? If nothing works, then it can be a troubleshooting extravaganza! First recommendation would be to test outside the case on a plain piece of cardboard or untreated wood surface, barebones configuration. Inspect the case for any errant standoffs that may be shorting/grounding the PCI-E slot. The primary graphics PCI-E slot not working can also be caused by a pin problem in the CPU socket. A bright light and magnifier will be needed for socket pin inspection.

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