1 of my USB ports is not working. Help?

Suddenly one of my USB ports is not working. No matter what I plug into it, it doesn't work.  Any help or ideas would be appreciated.  Thanks.

Not in the one that's ailing, but it does in the other one.  I've also plugged in an external USB hard drive and that doesn't connect.  Also a mouse's USB dongle and that doesn't work in the ailing one, but is fine in the other one.
I've also tried ( a couple of times ) to simple reboot hoping that would jog it, but that doesn't seem to help either.

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