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Hi , I`m JackPerhaps I can help you with this problem .
These sound bars can be problematic at times and may require several reboot this way ;
Unplug the bar 's power cord and hold the power button directly on the bar ,keep holding it for 20 secs or so then let the bar sit unplugged 30 secs and try it again
Note that you may have to do this up to 3 times before it gets going for good