iPad 3rd generation won't power off after update
ipad 3rd gen. wont pwr off after update for reset in recovery mode via mac
[Re-Titled by Moderator]
Original Title: iPad 3rd
If a forced-restart does not resolve the wedged iPad, contact Apple Support and discuss your options and alternatives.
An iPad 3rd gen (sold in 2012) may well have a hardware problem, and that won’t be worth fixing.
If your iPad won't turn on or is frozen - Apple Support
Contact Apple Support - Apple Support