My internal speakers are not showing up in output preferences

Head phones work fine. As soon as I unplug the head phones the sound icon goes from black to greyed out. The port works fine because if it was stuck it would not go from black to greyed out every time I plug and unplug the headphones. So the sensor is working and letting me know when the head phones are plugged in so please don't suggest a jammed port as an option. If it was stuck the icon would stay on constantly. When I look under system preferences>sound>output I only have headphones and Apple TV as an option. The internal speakers have disappeared from the list. When I reboot the macbook I get the familiar sound of the start up so I know the speakers work. I believe the problem started when we got Apple TV AirPlay but it could be a coincidence. Also I have been looking through the forums dating back to 2006 and have not found any thing that works.  Thanks for any new information.

Try resetting the SMC and PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
About NVRAM and PRAM

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