MY SOUND WONT COME ON!!!

When I turned on my Mac this morning I tried to turn on the soun but when I did the sound bar had a little cross at the bottem and when I when onto system prefrences it wouldnt let me turn on the sound! Plz help!

Does Restart brings back the sound?
If not, try this.
Go step by step and test.
1. System Preference > Sound > Output > Internal Speakers
    Highlight  Internal Speakers
    Make sure that Mute is not enabled.
2.Plug in and  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
    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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