I am having several problems. The biggest is that 50-75% of the time when I turn the Xbox on there is no sound on from actual TV. I hear the Xbox and the cursor, but no sound from the actual shows when I am trying to watch something. On Xbox Live support it says to disconnect the power and wait 30+ seconds so that it can release corrupted configuration data. When I reconnect and go through the entire devices setup process all over again I only get sound about 50% of the time. This is extremely frustrating, though thanks to the repetition, I've now memorized all of my devices and their model numbers. Games and anything directly Xbox related sound fine.
Another problem is everytime I turn on the Xbox it tells me it's lost my satellite or cable box connection/signal. I have a Comcast cable box (which ironically it still knows down to the model name) that is directly plugged in via HDMI. Again I have to go through the whole previous unplugging/resetting process to get it to work. Sometimes it doesn't.
Also is there a trick to the initial voice activation method of turning it on? I feel like an idiot saying "Xbox On" 10-20 times until it finally works or doesn't. Is it the phrasing? Timing? Loudness? I would really love to see an in depth tutorial / walkthrough on Xbox Live that details the ins and outs of how to really master the system.