Sometimes the iPad will freeze up and appear to be dead and only show a black screen. Usually you can fix this issue by resetting the device.
Press and hold the Sleep/Wake button and the Home button simultaneously for about 15 seconds. The iPad should then show the Apple logo and restart. If this doesn’t work, make sure you have enough battery power. Attaching the device to a computer or other USB port for power can take a bit longer to charge than attaching it to a power outlet, so be sure to give it a few minutes to charge before trying to power it on or resetting it.
These steps work most of the time. If the device still won’t power on after these steps, you may need to seek service from Apple.