Hi, my recent Nvidia 9800GTX has become faulty e.g. flickering and fragmented screen and the computer wont start up. It is not a Mobo issue since I can enter the BIOS etc. I just bought an ATI HD 5770 and placed it in the computer. Everything runs fine until I choose whether to start it normally or in safe mode as neither option works(It just waits at the screen for hours nothing happens). I cant uninstall the drivers from the 9800 since the comp wont start. Any ideas on getting the new card to work without going to get it serviced etc please. Thanks