I have just built a system consisting of
AMD FX-6100 Black Edition
Gigabyte GA-990XA-UD3 board
Corsair Vengeance 1600 2x2gb
Colloermaster HAF 912 case
Samsung lightscribe DVD writer
Seagate Barracuda sata3 500gb disk
OCZ 650 S series PSu
Powercolor 1024Mb HD6850 PCI-E video card
Upon construction I had no image on the moniter - just a black screen, I tested the power input, moved the monitor to the second port, just 1 flicker. Replaced it with a basic ATI card all worked well and I install software. I RMA the card and the suppliers replaced it with a new one.
The new card did not work!, I assumed it was a PC prblem and the PSU was a likely choice. I checked AMD certified PSU list and found only a few that they said were suitable. I bought a Corsair TX750 v2 PSu fitted it and still no response. I also stripped down a working PC and replaced it HD4850 with this HD6850 - No Joy. I put all things back with my basic ATI card and am working but have a second DOA HD6850 - what else can I do?
well maybe your old PSU toasted this video card, so before you configuring the TX750 may have just been burned too, some generic psus can burn graphics card very easily, i am almost sure that you can replace it and try the new one on the tx750w psu;