custom built HTPC, i3, 4GB, windows7
nVidia GeForce GT 430
AVerMedia A188c tuner card
Vizio 47" E470LE
Denon AVR-1611 Receiver
When watching tv through Windows Media Center using a tv tuner card, and when watching a channel in HD, everything is perfect. When I try to watch a channel is SD or when the HD channel has SD commercials, the tv screen video will turn on/off (the whole screen goes black). I've spent a few hours searching for an answer, but haven't found anything. Anyone else have this problem and have a solution? I've searched through settings and I'm pretty tech savvy, but what can I do to fix this? Thanks.