I have a 480 gtx that give me no display on boot. Computer posts, and I assume it load into windows. It just gives me no video. It worked before but I installed a aftermarket cooler. Thats when It stopped working. I also had to drill out all the screws because they would not come out. Now I tested the card after I had finished drilling (with the stock cooler) it worked. So I installed the aftermarket cooler. It worked for the night, I shut off the computer. Next day i took the card out because I was having freezing. I find out its because the ram was not getting along. So I installed the card again and no display. Attacked the original heatsink and still nothing. Any ideas? Also if something is broken can I have it repaired at any places you know of? Thanks