Hi, So of late have been noticing glitches (strange lighting artifacts, lines across screen etc) during video playback in Games or Movies, am wondering if it's the Vid card is going bad (ATI Radeon 1900XT VRAM 256MB) or if its my Monitor? An old but still functioning Apple 22" Cinema Display. System: G5 (11.2) Dual 2Ghtz, 8.5 GB's Ram running OS 10.5.8. also sometimes during games the screen will lock up or freeze requiring forced restart. Any thoughts or suggestions welcome. Cheers!