IMac will not charge/sync iPad Air - power icon oscillates between charging/not charging

Brand new iMac 27" Retina
Connecting an iPad Air (about a year old) to charge/sync/backup.
After the lightning connector is attached to the iPad Air and I reply "OK" to "Trust this computer", the charging indicator in the upper right oscillates between the running on battery indicator and the green charging indicator rapidly/constantly about 1/2 second between changes.
If I run iTunes, the device appears/disappears in the left menu/device list at the same rate.
I cannot charge the iPad when connected to the iMac (not a big deal, can use external charger), but cannot access with iTunes for sync or backup either.
Have tried cold booting both the iPad and the iMac, but that doesn't help.
Running OX X Yosemite and iOS 8.1.1

Hey rspiv,
The reason you are not getting a consistent charge on you iPad when it is connected to your iMac may be due to not being plugged into a high-powered USB port. As far as making sure that it stays connected to your iMac so you can sync with iTunes, try a different port as well as seeing if you can enable Wi-Fi syncing if it stays connected long enough. Take a look at the articles below for more information and troubleshooting options. 
Charge the battery in your iPad
http://support.apple.com/en-us/HT202032
iOS: Device not recognized in iTunes for OS X
http://support.apple.com/en-us/TS1591
Sync your iPhone, iPad and iPod touch with iTunes using Wi-Fi
http://support.apple.com/en-us/HT203075
Take care,
-Norm G. 

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