Volume up key (F12) is not working?

Last night my volume up key was working perfectly fine but this morning it's being unresponsive. I've tried resetting the PRAM and SMC and that hasn't helped at all. I can still adjust the volume through sytestem preferences but the keyboard function has stopped working. Any suggestions?

    Plug in and  remove the headphone.
    Plug the headphone in and out of the port 5 or 6 times.
    Try this even if you don’t see the red light.

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