My Ipad Wont Turn On After Update. Perform a force restart. ITunes will try to reinstall iOS without erasing your data.
After the process completes set up your device. Your network connection is arguably the largest determinant of the update process. While your device is connected follow these steps.
At time of writing thats iTunes 1233 3.
Hold on the SleepWake button for 3 seconds and then release your finger. Connect your iPhone iPad to the computer with its USB cable. If your iPad rebooted thats great but were not done yet. IPad models that dont have a Home button.