Try a hard reboot by pressing and holding the power button and select the option to restart the tablet. If unsuccessful check the manual or find instructions for that particular model and do a full reset/re-initialization. You will lose the settings and data if you do this reset.
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Try a hard reboot by pressing and holding the power button and select the option to restart the tablet. If unsuccessful check the manual or find instructions for that particular model and do a full reset/re-initialization. You will lose the settings and data if you do this reset.