iPad won't switch on after trying to upgrade to IOS 8.3
After trying to instal software update 8.3 I have been unable to switch on my iPad2.The Apple logo appears then disappears leaving a black screen.I have tried toto restore using iTunes, but the iPad exited recovery mode after 15 minutes leaving about 18 minutes still to be downloaded. Any help much appreciated.
iPad 2, iOS 8.2