If your iPad is unresponsive, connect your iPad to its Power Adapter and allow the iPad to charge. Then, while still connected to external power, perform a forced-restart:
Force restart iPad (models with Face ID or with Touch ID in the top button)
If your iPad doesn’t have the Home button, do the following:
- Press and quickly release the volume button nearest to the top button.
- Press and quickly release the volume button farthest from the top button.
- Press and hold the top button; do not release the top button until...
- When the Apple logo appears, release the top button.

Force restart iPad (models with the Home button)
- Press and hold the top button and the Home button at the same time; do not release either button until...
- When the Apple logo appears, release both buttons.

When performed correctly, your iPad will restart.