I currently have no sound from my internal speakers. When I go to system preferences, internal speakers is not an option - there is nothing there. What should I do to fix this?

I don't know what to do - I don't have any sound coming from my internal speakers, and with headphones there is still no sound coming out. When I go into system preferences under sound, there is nothing there - it says 'no output devices'. What should I do?

MacBook Pro model?
Hard to suggest a solution without knowing the model.
The following tips may not apply to latest MacBook Pro 13 inch model.
Go step by step and test.
1. System Preference > Sound > Output > Internal Speakers
    Highlight Internal Speakers / Headphones
    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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