iPad froze up after installing iOs 8.4
I installed iOS 8.4 on both my iPad2 and my iPhone 5s. The pone works great but my iPad is completely frozen up. All I can get is the Apple symbol and even that goes away after a few minutes. Holding down home and restart buttons does nothing. I tried connecting it to my computer but iTunes does not even see the iPad. Any suggestions on what to do next? Thanks.
iPad 2, iOS 6, 32g ATT 3g