We have found during extensive testing of the Neets Sound bar SB-1 that you can experience problems with the power connector and sod on the power plug.
During testing of the behavior of the SB-1 with power loss, where we repeatedly removed the power connector from the rear of SB-1, we noticed that a small spark can occur sometimes. If you repeat this disconnect enough times, a thin black layer of sod may appear on the plug. This thin layer will then eventually get thick enough to block for the connection and therefore the SB-1 will not power on.
We removed the sod with a cloth and everything was fine again and the way to avoid this is to disconnect the power at the wall socket first.