my pc crashed with blue screen of death and on reboot my gtx 8800gpu can be heard fan spins fast as usual on boot then settles down to slower spin but i am getting no display? is my gpu dead or is it another issue? If anyone can help as i really cant afford a new gpu right now is there an easy fix or is it big problems, also i have another gtx 8800 which worked fine till i upgraded to windows 7 now it only works for an hour then stops? is it bad drivers or over heating problem?