My iPhone 4S will only charge when it is turned off?

How do I fix it

Turn it totally off. Wait at least 1-2 minutes. Turn it back on. It's called a hard re-set.

I would do a hard reset. This is done by pressing both lock button and home button simultaneously until you see the apple logo.
This normally clears everything up. If that does not work, I'd schedule a genius bar appointment.GL!

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