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Please connect to power adapter and press and hold the Power button down for 20 seconds.
Release Power button and wait for a minute and turn it on if your tablet did not reboot automatically.
If that does not work, please do a reset
● Make sure tab is turned off, Press and hold the Power button for about 10 seconds to turn it off.
● Press and hold the “Volume Up” and “Power” buttons at the same time, when logo appears on the screen release the “Power” button and continue press the “Volume” button. Select Reboot system now or select Fastboot and select Reboot.
● Let your device reboot.
Please let me know if these methods worked out for your. Thank you.