Samsung js7000 tv nakamichi mk12 no audio?

[Powersro]

I'm trying to hook up a Nakamichi Nk12 sound bar to a Samsung js7000 tv via the ARC hdmi cable. The tv communicates to the SB somewhat (more later) because when I turn on the tv the tv goes to HDMI mode, the SB switches on and goes into "TV" mode and the volume controls work. However no sound comes out of the bar. When I go into Samsung's sound diagnostic it forces sound to the bar.
Strange anomaly: the sound bar turns on and off with the tv on every other one/off cycle. Works on first on/off cycle, not on second, then work on third, etc. Any suggestions?

 

[jsmithepa]

No suggestion, should (Mr. Obvious says) work!

Did you use the ARC-specific port on the Sammy? Of course you did.

Is there any Sammy configuration menu item that specifically turns on and use ARC?