I got my MacPro in the mail last thursday. By the next day I had it mostly set up, then noticed that when playing DVD's, HD Movies, Games, and apples own screen saver Flurry. A line moves from the bottom to the top of the screen in about ten seconds, the line isn't black but rather you can see a time distortion between what is above and below the line. It basically looks like a VCR with the V-hold set wrong. This occurs every thing that moving 2D and 3D graphics are displayed across the screen. I called apple on sunday and giulded me threw software Checks, then advised that I take it in and set an appointment for me later that day. The "Apple Genius" that helped me was a total gerk. The said and wrote in his service report that he determined that the GPU s likly functioning under spec. and that I should have more resonable expectations. I would rely like comments. Is watching a tv show or a DVD with smooth play back an unresonable expectation. My system is a Quad proc 2.66 with 1 Gig ram and the X1900 XT graphics card. He did take the computer in for replacment but said that if the issue isn't fixed then the problem must be considered within spec. By the way avoid the apple store in portland, I have been there seven times and the support service it terrible.