1. Possible Reasons:

1.1 Battery fully drained, possibly unable to charge

1.2 Incorrect long press to power on

1.3 Power button malfunction

1.4 Internal water ingress, mainboard damaged.

2. Solution：

2.1 Charging: 

Charge the device for at least 30 minutes, ensure it has power before attempting to turn it on;

2.2 Operation: 

Press and hold the power button for more than 2 seconds until the indicator light turns on or music plays;

2.3 Test the Key: 

If long press is ineffective, check whether the button is stuck or lacks elasticity, or test if music/light keys respond, to determine if the entire device is dead or only the key is faulty.

If the issue cannot solve your issue, please escalate to aftersales support.