Volume, Brightness buttons won't work

My volume buttons, Screen Brightness, and Keyboard brightness buttons randomly stopped working yesterday. I have tried everything I can think of (including making sure the standard function setting was unchecked. Any ideas?

Try SMC reset
http://support.apple.com/kb/HT3964
and pram reset
http://support.apple.com/kb/HT1379?viewlocale=en_US

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Volume, Brightness buttons won't work

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