Hi everyone Please bear with me if my question is stupid but I have been reading for several days without finding an answer. So I have a mac pro 2009, running 10.9.2. I decide to upgrade it with a Sapphire HD 7950, pc version. From what I read and heard, the only draw back of using a PC card is the missing boot up screen. Sadly after I installed the card and try to boot the computer, the screen remains black all the time no matter how long I waited. However it boots up windows perfectly. So I am wondering if I am missing something here? Because I saw a video someone used this card in his mac pro and booted up into mac, just missing the boot screen. Thank you.