F2 button for brightness won't work on 2010 MacBook Pro

I have a mid year 2010 MacBook Pro utilizing Mountain Lion 10.8.3 OSX.  For some reason the F1 and F2 buttons are not working for brightness.  Maybe I turned something off by mistake? If I hit F5 it shows a circle with a line in it like it is off or locked.  Any ideas how to get the brightness to work again?  Trying to avoid the Genius Bar if possible.  Any ideas?

Morning Alison Mcshane,
Thanks for using Apple Support Communities.
The System Management Controller (SMC) is responsible for many low-level functions on Intel-based Macs.
For more information on this, take a look at this article:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/ht3964
Best of luck,
Mario

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