I am unable to get any sound out of my internal speakers and no options to use them are available. Plus the mute box is ticked and greyed out and will not untick

How can I get sound from my internal speakers. I have not set or adjusted any sound levels but all sound is muted and am unable to untick the mute box.  I had sound when I bought the machine but now nothing, not even an option to select internal soeakers in Souns setup!!

1. Reset PRAM.  http://support.apple.com/kb/PH4405
2. 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".
3. Applications > Utilities > Audio MIDI Setup
    Audio Devices window
    Side Bar
    Click the Built-in Output.
    Under Mute any of the boxes checked? If so, uncheck it.

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