Been using my Tivo HD with plasma set at 720p Hybrid for a couple years. Last night, the video seemed to zoom to only show a fraction of the full picture. I set it to 480p Fixed and the full picture displayed. Tried Native, Hybrid, 720p Hybrid, & 1080i Hybrid and I get the same zoomed picture. I tried to reset and then unplugged the unit and no change. Any ideas to fix this or does it sound like a bad Tivo HD. Thanks for any advice/help.