I installed a Gainward GF Ultra/750-8X Xp (GeForce4 Ti4800Se). If I tried to run any games with 3D graphics, the screen has lines and dots that look like interference. I thought the card was faulty, and put back my GF2. The problems were still there... In Windows there is no problem with my old card, but the GF4 has small errors (small black dots, scrollbars leave a "track") What could be the problem? Surely the motherboard/agp-slot can't be busted??? And yes, I had new drivers, directx 9 (also tried 8), new bios.