hello i upgrade my mac pro 1.1 with a xfx hd 5770 PC card,that works very good after os x has booted im running lion with latest updates. and i cant open any 3d app or opengl,its crashes i installed steam and tried to launch half life 2,it show down its opening but the icon goes away after 2 seconds. also i tried other games but same result its icon show for a couple of seconds then it goes away. in windows games play perfect. i downloaded gputest,but when i hit run benchmark i get "gputest quit unexpectedly" using firefox on youtube with latest flash player installed, video works perfect what could cause this problem ?