I know I have read about a quick solution to my issue somewhere along the line, but I can't find it again. My HTPC is connected via HDMI to my TV, and every so often I will start up the TV(PC always on) and get a black screen. It is most often when there is no Live TV running on media center. I can press the remote buttons and start a recorded or live show, hear the sound, but no picture. Reboot cures all. I seem to recall some combo of buttons on the keyboard that would force the TV to do somewhat of a resync with the HTPC and get the screen fired up again. Anyone know that magical button combo? I'll be writing it down this time!