Hi,
There's very little things you can do with a tablet problem since everything is built in. The only troubleshooting step you can do is 1. Press and hold the power button of the tablet for couple of seconds then try booting it up again. 2. Charge the table for about an hour and see if it will boot up normally. If 2 steps will not work and if the table is still under the factory warranty from Lenovo, do contact them right away for a repair.