I'm having problems when running my Dell LCD monitor on both DVI and VGA. I've got both cables plugged into my 6600GT video card. Both DVI and VGA works fine, except when playing videos through any media player. When I have both VGA and DVI plugged in, only the VGA plays videos properly but the DVI channel does not display the video - only the audio works. When I remove the VGA, the video playback is visible. Is there a way to fix this?