If the unit will not power on, please disconnect the power cable from the back of the unit and from the outlet for 20 minutes.
While the cable is unplugged from the AMBEO Soundbar, please confirm that we are not dealing with a switched/trip fuse outlet by plugging a different device into the socket we are trying to use with the AMBEO.
If the socket does not work, look for a wall switch or trip switch that may activate the socket. If the socket in question is in a surge protector, please ensure that there is not a "Master" socket that needs to be powered on in order to turn on switched outlets.
If you are getting power from the socket, please reconnect the power cable to the AMBEO Soundbar, then the outlet, and see if the unit can be powered on.
If it cannot be powered on, check for LEDs visible through the grill, on the front of the unit, or on top of the soundbar while changing the volume or changing the source input.
Finally, check the Smart Control App to see if the unit can be connected. If it can access the Soundbar, then the unit is getting power.