I have the same problem with ONE of the two box office. (brand new)
And with HDMI or regular output, on 3 TV set.
And i is easy to reproduce in my case.
Each time i turn it off it do not show " system shuting down" but close with the red light. If y turn it on ( with the remote) 2 green light come up but with no image (hdmi or regular) output on any tv set i have. I have to turn the swith off and on to get picture back on.
my boot code is 18
Any clue on this?