Sheesh, I forgot. The first thing to do is disconnect the power for a while. Give it an hour. Then plug it back in. See if that helps, if you haven't done that already.
It's one of those things that's so random, it'll be the luck of finding someone who has dealt with that specific model. Usually you can find it online, but not in this case, it seems. The processes I saw for older models were a lot more elaborate than the ones I've been familiar with. Usually...