How do I get the sound to work on my macbook pro?

All of a sudden the sound has stopped working on my macbook pro. It only works when I plug in speakers or headphones. I've been into system preferences and nothing worked. The sound icon at the top right of my screen is greyed out... anyone help with how to get it working again?

System Preference > Sound > Output > Internal Speakers
Make sure Mute is not enabled.
If you see red light in the headphone port, plug the headphone
in and out of the port 5 or 6 to flip the microswitch inside.
Sound output may be stuck in the digital mode.
Reset PRAM.  http://support.apple.com/kb/PH4405
Reset SMC.     http://support.apple.com/kb/HT3964

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