Hello, I am having an issue with replacing my Nvidia 9500gt with an HD6670. I've done everything from uninstalling all Nvidia drivers to running driver cleaner software but nothing seems to work. I upgraded my Pavilion's PSU to a 500w Antec, so power should not be the issue. When I start my computer up, I am seeing some vertical lines and my screen will flash twice with a 'matrix' like screen. Then when Windows loads, I install the drivers for the new card and reboot. Windows will not load except in safe mode after the drivers have been installed. If I attempt to load windows normally, I get a blue screen telling me there could be an error with hardware. I know the video card is fine because I had my roommate try it on his system. If I put my old 9500gt in, it works just fine after installing the old drivers again. I was thinking of reformatting, but I thought I would ask here first. Any ideas?