Asus P8Z77 VLK not detecting Sapphire R9 270X 4GB?

Question

Iron

It was decided, the socket legs of the processor were bent.
The situation is as follows, there is a computer based on Asus P8Z77 VLK with AMD Radeon HD 6770. I bought Sapphire R9 270X 4GB on occasion. When installing a new video card, the monitor does not display a picture when the computer starts. Power supply 550 watts, threw back all the peripherals and screws. The BIOS version of the motherboard is the latest.
Where to dig? Google says that the components are compatible.
It was decided that the legs in the processor socket were bent.

Answer 1

I see no reason for incompatibility, does this card work on another PC? Perhaps she just got caught.