The choice of headphone jack is not showing up under the system preferences - sound output options.  Therefor, my speakers suddenly do not work with my iMac

On my Intel based iMac, OS 10.6.8, my speakers suddenly were not transmitting sound. When I checked the System Preferences, Sound output, the headphone option was no longer available.  This has always worked in the past - what is up?
Anyone have any suggestions???
Ellen

Applications > Utilities > AudioMIDI Setup.app
Audio Devices window
Side Bar
Click the Built-in Output.
Under Mute any of the boxes checked? If so uncheck it.
Plug in the headphone and check whether in the output  headphone shows up in the same panel.
If so, you can adjust the volume there.
  Reset SMC and PRAM.
     Reset PRAM.  http://support.apple.com/kb/PH4405
     Reset SMC.     http://support.apple.com/kb/HT3964
     Choose the  appropriate method.
Best.

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