Your tablet device does not work.
Press and hold the power button for about 10 seconds to force it to turn off, and then turn it on again [Details].
If you cannot force your tablet device to turn off, remove the battery pack after unplugging the AC adapter,
then install the battery pack in your tablet device again. Wait a while after you install the battery pack in your
tablet device before turning on your tablet device.
Contact the service/support center named in the warranty if this does not solve the problem.