I just had the problem. it would charge and the light would turn on while charging, but when unplugged the light would not turn on at all. Tried to reset holding the power and each of the other buttons for 10 seconds and it didn’t work. Was about to give up, then I plugged it in so the light came on, then i held the power button and simultaneously unplugged and some lights started flashing red and white and then it turned on and asked to reconnect to my device. Maybe I just got lucky.