I have a second-hand Nakamichi sound bar with sub woofer. Both power on and have an HDMI cord attached, but my TV will not recognize it. I also connected a set of speaker cables (red/white) but that doesn't work either. All I can figure is my TV is telling me that the speaker needs to have its reset button pushed to bring it back to factory settings. Can't find that anywhere. Don't know the model number as there is no remote.