My iphone does not charge or show up as a device in itunes when i plug it into my computer

I've never had a problem connecting my phone to the computer, but in the last two or so weeks I have been unable to sync or charge my iphone 4 through my MacBook Pro (OSX). The phone does not charge and it does not show up in the "devices" section of itunes. The cord charges through an AC adaptor with no problems and my USB ports all work fine. I have done everything suggested so far, including deleting podcasts, restarting my computer, restarting the phone, uninstalling and reinstalling itunes... I'm not sure what else to do. Any suggestions would be very welcome!

I removed the AMDS as part of the instructions for completely removing itunes. Nothing changed unfortunately. I don't understand why it is happening!
I have already checked for lint, etc as you suggested, but don't have another USB cable on me at the moment. I'll be returning home tomorrow so will try then, but I would have thought the cable was fine as it still charges the phone through an AC adaptor fine. Thanks for the suggestions!

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