Two possible reasons: check the power indicator is on,
Connected to the host power supply is wrong, or if there is a short circuit;
Processing method: two power supply is not electricity, wouldn't light properly connected the power cord; Insurance on the 220 input line pipe and burn out, need to change.
First detection talkback host and its surrounding wiring, then test the power and the surrounding wiring; The last detecting various indoor extension and surrounding wiring.