Soundbar 3000: cannot get sound
I just installed this with a new TV, and cannot get any sound, even after following all of the troubleshooting steps listed in the online manual. No sound for 1930s music, either, or old films (i.e. pre-5.1 recordings).
The TV speakers work, and I have set the TV to external speakers to try to use the Soundbar. The TV is on PCM (it won't let me select Dolby anyway).
I use Roku and I stream laptop-to-Apple-TV without problems using the TV speakers -- I have no cable, no dish, no external antenna, no Blueray, etc.
I've rechecked all the connections (I tried both RCA analog, and digital optical), toggled the mute, etc. The Soundbar green light is steadily on, the sources are matched, the bar responds to the remote -- still no sound.
The TV is a Sumsung UN46EH6000.
Any suggestions? Please?