I've just received my graphic card and installed it into my computer, but after I tried turning it on the light would flash and the fans would spin for a quick second and doesn't turn on. I had it in the 16x pci express slot and it didn't work, so I tried the 8x but I got the same results.
My motherboard, psu and grpahics card is:
•Gigabyte GA-Z77X-D3H
•EVGA NEX650G Gold
•Sapphire Radeon 7750HD
Also, I know it's a cheap card but it worked fine on my old duo core 2 computer. I also used to use my old pny nvidia geforce 7900 gs on my new pc and it worked fine as well.