In addition to force restarting and DFU mode restore, there are still other solutions for fixing iPad stuck on Apple logo:
Press and hold the Power and Home buttons till the screen is black, press and hold Volume Up and Power buttons until Apple logo reappears, and then release the Power button but keep holding the Volume Up button till you see the lock screen.
Restore or update the iPad in recovery mode. If you see any error codes iTunes, you can find the exact issue in the article: [https://support.apple.com/en-us/HT204770|http://gg.gg/5824b]
Use a third-party software to reinstall the iOS without restoring.
<Edited by Host>