When I playback DVD's (using PowerDVD demo) and when I watch HDTV on my HTPC (using ATI Media Center), I receive visual artifacts all across the screen. They resemble the white noise you receive when you have the coaxial (TV) input selected on a TV without a signal in pattern, size, and appearence except they are the correct colors. I've noticed that both in DVD's and on HDTV large expanses of solid colors do not have artifacts (i.e. titles, menus, etc.) I do not have this problem at all on my destop or while playing games; my wallpaper and Half-Life 2 are both crystal clear. I've run several games in resolutions between 640x480 and 1920x1080 all without problem. However, CG animations within the games DO have the artifact problems (I'm pretty sure they're all in 640x480, if that helps.) I have a PCI Express X800 XT and an ATI HDTV Wonder Card. My HTPC is connnected to a Sony 34in HDTV CRT via a DVI to HDMI cable. I'm not even sure how to begin to tackle this problem, so I would appreciate any advice.