Hello I have a mac pro 2008 model with a GTX 285 Mac Edition and it's not working anymore, and yes i'm sure 100% the problem is from my GTX 285 not something else, the reason why i know that? Every time i turn my mac pro on, it lags and just do nothing but showing me the desktop and the mouse, btw i can move the mouse around, but when i press any thing i have to wait for hours to do that somthing, but when i removed it and it replaced it with my old ATI 2xxx it's working again. Anyways what should i do: Go to apple? Go to nvidia store? Go to EVGA website? Cry for wasting 500$?