I have seems multiple posts of different button combos being held for 10s to reset demo mode. My fix was the BT button and the “play” (right triangle) button. Try different buttons paired together for 10s and the power light goes out as it powers down and then you can hit power and it will be operational. So many people have been saying the batteries are dead but I have 5 of these and never once has the battery been the issue. Good luck!