I bought Wind Fast nVidia px 8800GTX and my computer can't find it. Monitor says NO VIDEO INPUT, but when I turn my PC on, cooler starts to spin and still says NO VIDEO. For now I'm using other video card (GT9600), but I still keep the 8800gtx installed in my PC, but "Device Manager" finds only 9600GT. Any sugestions how to fix that 8800GTX?