The volume keys on my MacBook Pro stop working after using headphones.

The volume keys on my MacBook Pro recently stopped controling the volume after I've used headphones. I still have sound; I just can't make the volume increase or decrease. The mute, however, still works just fine. Because I have sound from the intenral speakers I know the computer doesn't think the headphones are still in the jack. A reboot fixes the problem, but as soon as I use headphones the problem starts up again. I want to fix this permanently.
I don't know if this helps but all the other keys (brightness, play/pause, etc) still work. I recently had to reset the PRAM because my computer refused to sleep when the lid was shut. I've checked system preferences and everything seems to be in order.
Can someone please help!?

I found this advice on another thread after encountering the same problem - I did the reboot and it worked fine and dandy!
I spoke with Applecare to fix my Macbook volume. Apparently there are pins inside the speaker/headphone jack that can get jammed. We fixed mine by doing some sort of reboot:
Turn off laptop.
Hold down the Option, Command, P, and R keys (all four at once, it's tricky!) and while holding down the four keys, turn on the computer. When you hear the second chime, release the four keys.
This re-set the sound toggle to internal speakers. Now I'm afraid to insert headphones again, but I assume this reboot will work over and over.

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