The internal sound dosen't work

I have a MacBook Pro 17inch unibody 2011
Every thing was just fine until I restarted my mac then when it started up again the sound icon went gray and I can't controlle it any more I also notice that my trash is empty although I had some stuff inside it and my usb slots dosen't work also
I had tied every thing to turn the audio back on but I failed
I am sure that there is nothing wrong with the hardware because I still can hear the music at start up so I think it's something with the software system
Please I need your help

Look at these links to see if they will assist you:http://http://support.apple.com/kb/HT1379
http://http://support.apple.com/kb/HT1379
http://http://docs.info.apple.com/article.html?path=Mac/10.7/en/mh26871.html
http://http://support.apple.com/kb/HT1895
Ciao.

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The internal sound dosen't work

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