macos itunes recognizes ipad but sync is greyed out
iMac: Retina 5K, 27" running 10.11.3
iPad: MC756LL/A 56.4GB capacity, 4.7GB available running iOS 9.2.1
iPad seems to work but I can no longer sync it to my computer. It shows up in itunes but the sync button is greyed out. Everything is running latest versions. I always back it up to the iMac and update the apps through the iMac when I sync but I haven't been able to sync in a month.
Has this ever happened to anyone and if so, what can I do to fix it???
Thanks, Tom
iPad 2, iOS 9.2.1, 64GB