How about screen brightness and the update???

I have noticed my screen brightness to be lower after the update...I usally have it set to 50% and after then update was complete the brightness was alot lower on the same setting?? ANother person on mac forums had same issue

Try a different keyboard with your computer if possible. If it woks well, it's a hardware problem.
http://support.apple.com/kb/TS1381?viewlocale=en_US

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