Looking for a fix to a stock graphics card that is sometimes recognized by MacPro (early 2008) on boot, and works fine, but needs reboot if not seen. As seen from screen sharing graphics info in "About this Mac" is blank. Current card is a ~2 y.o. replacement to stock ATI Radeon HD 2600 XT 256 MB The old card was faulty and would cut out after a few minutes, but this one works fine until shutdown, then is sometimes seen, sometimes not. Time for a new card or is there a fix I should try? Any ideas appreciated or do I just go.. http://forums.macrumors.com/showthread.php?t=1656298&highlight=2008+graphics Running 10.8.5 but have Mavericks on another internal that seems to work fine if need be, just don't like the "no single window spread across multiple screens", BTW can that be turned off?