With the charger connected try a hard reset to see if you can get to the recovery menu.
Be aware that if this works it will erase all your data and downloaded apps and restore the tablet to its’ factory default condition.
Ensure the device is off and then press and hold the Volume Up button and then press the Power button, hold both on together for 5-7 seconds and then release the Power button only. When you get the Android recovery menu on the screen, release the Volume Up button and scroll down using the volume buttons to wipe data and then press the Power button to commence the action.
Be patient, it takes a while to perform the reset.
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