What brand and model is your psu? Inspect the card and cable connections for obvious defects such as burn marks or missing resistors on the card. If it all looks ok and you have tried swapping the cables around then chances are that your card is DOA (dead on arrival)
swapping cables once again. See if it works. My psu is an antec quattro 850 watts. How can i tell if my PCIe is in 16x lane mode? its in the corrects 16x slot, but can you change modes back and forth on the?
Ok I see. Its running at x16 so thats no the prob. changed cables, now uninstalled and reinstalling just the 10.7 drivers. See if that works..... btw how do you start a game in widowed mode? whats the hotkey? forgot lol. ctrl esp enter? no?