Hey there, I have some problems with my new 7950 Sapphire Mac Edition and just wanted to check if anyone has a solution before returning the card. My Mac Pro is a 4.1 with the 2 x 2.26 processors running 10.9 Mavericks. Whenever I use the card in PC-mode it works fine but without bootscreen of course. When I put the card to Mac-mode it does show the bootscreen but whenever Mavericks is up the display turns black again. For me this seems to be an issue with the drivers eventhough I dont quite understand why the card works in PC-mode then. Did anyone have similar problems with the 7950?