Just hooked up my 970 today after about a week and a half. Did the upgrade before i hooked it up. Turns out I have the "no audio" problem on all inputs also, including the tuner. At first I was able to get the audio back by switching inputs but after the last time, nothing I do will bring it back. It also made a REALLY loud hum with popping. Tried to reset and still nothing. Love my 950, but need the DVI switching. I think it's going to have to go back.