I can not get my mac book air off mute

I can not get my mac book air off mute and it is grayed out in the "system Preferance" sound section page.

OS X Mountain Lion 10.8.3
Hopefully one of these steps should solve the problem.
1. System Preference > Sound > Output > Internal Speakers
    Make sure Mute is not enabled.
2. Remove the headphone.
    If you see red light in the headphone port, plug the headphone
    in and out of the port 5 or 6 times to flip the microswitch inside.
    Sound output may be stuck in the digital mode.
3. Reset PRAM. http://support.apple.com/kb/PH4405
4. 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".
5. Applications > Utilities > Audio MIDI Setup.app
    Audio Devices window
    Side Bar
    Click the Built-in Output.
    Under Mute any of the boxes checked? If so uncheck it.
    Option click the speaker icon, if present and select Internal Speakers.
6. Install Combo Update ML 10.8.3
http://support.apple.com/kb/DL1640
Best.

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