Hi, For several months now I have had problems with my Mac Pro (Desktop) I would get colours appearing n patches in my apps like Safari and iTunes. Then it started getting worse with pixels appearing across the screen and lines. Then I would get crashes. These would involve the desktop freezing. The cursor would still move around but could not open anything, move windows and the clock had frozen. Sometimes the freezes would occurs within seconds of turnng on or rebooting the computer, other times the computer can go for sometime without crashes. But usually when the lines across the screen, pixels or patches occurs a crash comes soon after. I have tested all the ram by removing all and then testing each one at a time and that does not solve it. And I know it is nt a software issue as I have anther hard drive involved running windows through Bootcamp and that hard drive has the same issues. I hope you can help. Thanks.