My iPhone 5c won't charge/connect to my Macbook Pro or iTunes. When I plug it in via USB nothing happens, it's like I never plugged it in. If I turn my phone completely off and plug it in to my Mac it will turn it on, but once it's on it continues to act like it isn't plugged in. It connects fine to the wall plug. I have tried a different dock and nothing (It just started doing this recently) and both my phone and computer are fully updated.