My mac don´t have sound

I recently installed the IOS 10.8.2 on my Mac Book pro, if not as a result of the installation or not it has anything to do, to play any movie or music from itunes not hear. Moreover, trying to dictate to the mac book, this does not hear me.
In sound system preferences can not select or modify anything attached screenshot.
What can you do?
Thank you.

Hi j,
Have you tried a pair of ear phones yet? If not, try it.
If no luck, gently pull them out and push them in a few times.
If no luck, try the following:
PRAM Reset: http://docs.info.apple.com/article.html?artnum=2238
SMC Reset: http://support.apple.com/kb/HT3964
Safe Boot: http://support.apple.com/kb/HT1455
http://support.apple.com/kb/HT1564

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