My sound is not working anymore on my mac book pro

My sound on my mac book pro is not working at all anymore. I used it in the morning and it worked just fine and i came back at night and my sound was gone. I checked my output settings, raised the volume up all the way, made sure that i wasn't on mute, everything... Even when i plug my headphones in it doesnt work...
Any ideas???

Hopefully one of these steps should solve the problem.
1. System Preference > Sound > Output > Internal Speakers
    Highlight  Internal Speakers / Headphones
    Make sure that 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
    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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