So I set up my 7970 rig, first crossfire then back to just a single one because I don't have the psu for two. Okay. So I got one 7970 hooked up, working fine. Then, while playing with the settings in catalyst, pushed it too far and crashed the display drivers, leaving a blank screen. Coming from an nvidia card previously, and using precision x, I figured it had a safe mode while if it was crashing, it would revert to default settings. But no. Of course not. So I'm stuck every time I turn my pc on, to look at the desktop for a few seconds and it going black. I've uninstalled it, and reinstalled it, same thing. I've tried everything under the sun. Nothing works. Please help!!!! Thanks in advance.