The battery might be dead. Also, make sure the device is plugged in properly when charging. It is also important to make sure the charger cable is not damaged.

This problem may be fixed by completing a hard reset. This reset will delete your settings and files in effort to restore the device. If this does not work it may be a result of a software issue. If that is the case refer to the manufacturer website for additional instruction: Azpenpc.com/service/