How do you restart a live TV program from the beginning even if you're not recording?
hit the guide button and look for a triangle on the current live channel listing for the program. If it is there then you can 'restart' it by watching the on-demand version of the same program.
You are also supposed to be able to click on the microphone button and say "restart this program" when you run into a show that has already started. All it did was restart my box. Then my remote wouldn't work at all. I had to unplug everything and have it reboot again. Now my voice commands aren't working at all. "Something's not quite right, voice commands are not working now. Try again later" is the error message I get.