I have the 2009 MP and recently installed the Sapphire HD 7950. This card shows the unpleasant behaviour of letting the monitor black until the user selection appears. If I try to select the startup disk (pressing "option" upon start), the screen stays black and I cannot select any boot volume. OK, fine, this wouldn't be too big a problem, if I wouldn't need to switch to my bootcamp drive from time to time. Does anybody know how to solve this conundrum?