Press both att & ok - rlse - all mode keys flash twice
enter 944 - all mode keys flash twice
press TV- tv will flash once
press aux - aux flashes three times - ready for TV codes
That's what worked for me.
I am having an issue with error code C as well. I moved recently and hooked up the soundbar at my new house but to the same TV i always used. I originally connected it with the red and white cables like I did at my old house and was getting no audio with the flashing third light indicating error code C - overcurrent. i thought maybe i connected the wrong AC power cord so connected another one and tried again with the same error. I tried lowering the volume to one, turning it off, waiting, then turning it back on and still had the same problem. Any suggestions of what else i can try? Thanks much!