I recently hooked up my main comp to my Vizio 37" LCD HDTV and no matter where I had the settings, it looked like crap and the audio was terrible. I became curious so I hooked up my Dell Inspiron to it via VGA and ran a simple audio input cable and WOW. B-E-A-U-T-I-F-U-L. I don't get it. I have a Radeon 4670 btw. However my Sony Blu-Ray player hooked up via the same HDMI cable looks and sounds spectacular. So its gotta be the video card. I'm just surprised, you would think a GRAPHICS card would put out, you know, decent graphics via the HDMI if its going to have it.
