Hello everyone. I've run into an issue with dual booting on my Mac Pro. I bounce back and forth between OSX and Windows because I'm a musician and gamer. I have the two installed on separate internal drives. I've always used the hold option/alt method during system start up to select which OS/drive to launch. However, it seems I've lost the ability to do that. The issue is I installed a new graphic card. It does have native support in Mountain Lion and I've tested it over on that side. Works fine. The problem now is that I overlooked the fact that I set the system to automatically boot into Windows instead of OSX. When I hold option/alt during system start up, I no longer get the screen to select which OS/drive I want to boot. Just get a blank screen and no progress. Does anyone have any idea on how to resolve this issue. I really need to be able to get back into OSX to write and record tracks. Thanks in advance.