Macbook OS X 10.8.2 Volume keys: F10, F11, F12 stopped working as volume keys. How to reset?

MacBook 13 inch version OS X 10.8.2 Volume keys: F10, F11, F12 stopped functioning as volume keys.  How do I reset to function as volumes again?  Thanks.  chas
RSVP ASAP

Dear Barney-15E,
Your answer got me on the right track.  I followed the suggestions as well as I could.  Finally I ended up holding down the fn key as I pressed f10, f11& f12.  Each one now works as it had before something happened. 
chas
Infinite Gratitude, Love, JOY, NOW!

Similar Messages

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    System Preferences>Keyboard:
    - this is from Snow Leopard so Mountain Lion may be slightly different but the principle should be the same. If it isn't you need to ask in the Mountain Lion forum.

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    Hello,
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    HI,
    Do an Archive and Install.
    To reinstall Mac OS X:
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    Help!
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    Delete the System Preferences plist per these instructions:
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  • 17" unibody - volume keys stop working

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    thank you for your reaction, it solved the problem temporarely,
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