If it was off, once you see the Apple logo, count to three ... "iTunes has detected an iPad in recovery mode. You must restore this iPad before it can be used with iTunes." ...
Keep holding until you see the recovery mode screen on your iPad. Release once you see it. If you’re unsure about which ...
In the cases where you've forgotten your iPad password or need to change it for security reasons, Apple offers two ways ... put it into Recovery Mode. If you have an iPad with a Home button ...