Bretford Cart "Not Charging" iPads
We have a Bretford cart with 20 iPads that used to work just fine, but now when you plug the iPads in, they say "not charging" up in the top right hand corner. Can't think why this is. There is power to the cart. I have green lights for banks 1-10 and 11-20, but all the iPads say "not charging". I unplugged them all and tried plugging them in one in at a time, but it still says the same. Ideas? The cart is probably less than a year old. I can sync and add apps, but not charge devcies. Ideas??
iPad, iOS 6.0.1