I live in Brooklyn, NY and have TWC as cable provider, with a Scientific Atlanta 8300 HD DVR cable box feeding via HDMI into my Denon AVR-4306 receiver then via HDMI again to my Fujitsu "42 plasma monitor. Often, when i try to tune to any of the HD channels [701 and up], i get the audio signal, but no picture, just a gray screen. The picture returns only if i turn the monitor off then on again. Does anyone else have this picture problem? Can anyone suggest a solution?