Hi all, I have a terrible problem with my early 2008 (8 core) mac pro. Everytime I am editing with final cut, after around 5 minutes, the contents of the screen will start to act very strangely and before I know it, the whole screen is garbled with multicolored shapes and lines (see screenshots below). The system will then completely crash and I will have to hold the power button to shut down. Yesterday, I took it to my local apple store and they put it down to a broken graphics card and fitted a replacement, today its happening again! Please take a look at the screen shots posted and let me know if any of you have had this problem or if you can help to shed some light on this issue for me. I'm running an ATI Radeon HD 2600 / snow leopard. screens:: http://i96.photobucket.com/albums/l166/a-bomb7/Screenshot2009-09-29at175535.jpg http://i96.photobucket.com/albums/l166/a-bomb7/Screenshot2009-09-29at175717.jpg http://i96.photobucket.com/albums/l166/a-bomb7/Screenshot2009-09-29at191644.jpg http://i96.photobucket.com/albums/l166/a-bomb7/Screenshot2009-09-29at175521.jpg thanks for reading.