http://www.passionemac.com/get-macbookpro/
How can mute my macbookpro?
The volume icon has disappeared from my desktop when i click (fn) + F3, F4, F5 is a symbol abears undeneath block the speaker icon. I went to system pref, and seems to be silent, and available for off isn't it! I also noticed that the keyboard isn't light work, either with the shortcut im not using the headphones the speaker of your real team …
You are NOT going to believe the solution for that. Take a toothpick and push on the headphone Jack to push a button. Once you press the button, should work again. Careful not to break up with him but on the inside. This is a problem known as the MacBook. Some people have fixed with inserting and removing the headphones several times.
Don’t Get Your Mac Jacked – iAlertU