USB port not working on MacBook Pro – reset the SMC

Half of my USB devices suddenly seemed to stop working.

At first I thought it was the USB hub. It was hard to work out how it should respond – should there be lights on or not?

Then I tracked it down to one of my USB ports on my MacBook Pro.

Fortunately, it turned out resetting the SMC (Systems Management Controller) did the job. This article has more information although it doesn’t explicitly mention USB ports.


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