I bought the GeForce 6600 AGP 256MB for my PC. I plugged it in turned it on and everything worked fine. I started to play a game for 30 mins then the PC just went off. The PC will not turn on anymore. I notice that the Grapics card had a power socket but I didnt plug a power connection into it, could this have done some dammage. I tried pluging in my old card but nothing. There is some power getting through as the lights on my modem and games controller come on and the power light flickers and the man on the cpu try to turn but the pc will just not start. Can anyone please tell me what I have done and how hard/expensive will it be to repair.