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My iPhone 4 will not connect to my MacBookPro. It will not charge on my MacBookPro, but it will charge on a wall socket and it will play music in a 3rd party speaker system??
This is extremely frustrating not only can I not back up my iPhone but I also can not update its OS etc.
Have you tried other USB Sockets on the MBP?
Have you tried other devices in these USB sockets?, do these work?
Sounds like a fault on the Macbook

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