Ok, well first recharge it completely. Again. Then try starting it in "Safe Mode" to see if it will actually start up. If it does, then you have an app or other software that is messing with the device. It may not have kicked in until the tablet was turned off. So you will have to try and find what app/software is causing the problem. Then restart the device out of "Safe Mode". If it happens again, just start again in "Safe Mode" until you locate the problem.
To get into "Safe Mode" please do the following.
1. First turn off the tablet.
2. Next press and hold "Power" until you see the manufacturers logo on the screen, then release the power button.
3. "Quickly" press "Volume Down" and hold it for few seconds until you see the...