TS1574 Hi, I dont have sound on my imac. The options in sound are greyed out and there is nothing in the output list

itunes and you tube are not working.  There is no sound. When I am in itunes and play a song, the song does not start.
I checked system preferences, sound.  There is no output options and the input options are greyed out.
Does anyone know how to fix this problem?
Thanks

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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