Without sound, and doesn't aloud me to turn it on

Hello sorry for my english, I'm from Argentina. Recently I´ve installed mountain lion and today I realised that my notebook doesn't have sounds, the icon apears in grey, and in sistem preferences apear off, but I can't turn on like in the picture. Please somebody can help me????

Reset PRAM.   http://support.apple.com/kb/PH4405
Reset SMC.     http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".

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