So, I had my brand-new TV (unhacked, so far) connected to a standard-def TV via component and got it set up, synced to my MBP, etc. Everything was going along fine and dandy. Then I took it to another room and connected it to an HDTV via HDMI. Connected the audio outputs to the surround-sound receiver. The machine boots fine. I can hear the menu noises through the receiver. No video. At all. When I go to select HDMI on the TV, it's greyed out. Any idea what's going on there?