I tried what you said and it worked for me, I went through about 5 sets of numbers but it worked, thanks for the answer to this question that someone else wrote but I needed as well!
Volume button and mute buton does not work. This am when TV is off tV came on all b itself.
do you have more than one set top box? perhaps the remotes got switched? press the "A" button and go through the remote setup process.