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found solution same solution to if you run it to no battrey
My tablet isn't charging properly
If your tablet isn't charging properly, please confirm that you're using the charger that came with your Nexus 7 tablet. The Nexus 7 charger is rated at 2A, where as most phone chargers deliver a current of 1A or less.
If you're using a charger rated less than 2A, your tablet may charge very slowly, or may not charge at all.
Charge a drained battery
If your Nexus 7 tablet's battery drains completely, you can recharge it by following these steps:
Connect the charger to your Nexus 7, then plug the charger in to an outlet.
Press and hold Power until the device powers on, then immediately press and hold Volume Down (while still pressing Power). You will see the word Start with an arrow drawn around it.
Press Volume down until you find Power off, then press Power to select that option.
When your tablet is off, disconnect the charger, then reconnect it.
You should see a battery on your screen that indicates your tablet is charging.