Please check if the plugs and sockets are dirty. Wipe them clean with a cloth.
If the issue persists then please follow the instructions below...
Step 1: Unplug the Sound bar power cord from the power outlet
Step 2: Press and hold the power button on the Sound bar for about 25 seconds
Step 3: Plug the cord back into the power outlet and check if the Sound Bar turns ON
If the issue persists then please contact our Customer Support Team at 888-842-3577 for further assistance