Hi! I recently got my intel iMac 20" with 128mb vram.. i thougt 512mb of ram was to little, so i installed a 1GB stick of Twinmos 5300 667mhz (the recommended) It worked fine for one day. then suddenly i started to experiance some issues with my display. a small hair-thin (about one pixel thin) darker line occured on the horizontally from top to bottom of the display. (about one inch from the left side of the screen) i tried a variaty of things.. when i switched places with the ram-sticks the problems was gone for an hour tops.. Then it occured.. again! So i took out the new 1gb stick of ram, and kept the original (512mb) in.. This seems to solve the problem.. (has been working all night now without issues) So my question is: Can a faulty RAM-stick cause display issues? Everything else worked fine, and the computer did work wery well except for this.. Shouldn't a faulty ram (non matching for my computer) get errors and artefacts directly from the start when i put it in?? Has anyone here experienced these kind of troubles?