Computer G4 DP 1.25 MDD Video Card Radeon 9800 mac pro Running latest version of 10.4 No new hardware or software It started this morning so I didn't have a lot of time to play with it. I did check that the card was properly seated and that cables were connected. Lines appear on my main display and a TV driven by the S-video feed. See attached picture What is interesting is that lines don't appear on new windows and if I change the desktop pattern it goes away. For how long I don't know. I suspect a video card problem. If it is should I just have the card repaired or should I buy a new video card.