Internal speakers not shown in sound output, no audio jack red light

Hellooo!
So basically my internal speakers in my mid-2009 Macbook pro are not working. When i try and change the volume i am getting the greyed out speaker symbol. Strangely, when a pair of headphones are plugged into the audio port and set to 'audio input' the internal speakers show up in system prefs, and the sound start working! When the headphones are removed it reverts back to not working again. I'm not getting the red light in the audio port.
This must be a software problem as they physically work when headphones are plugged in and i can hear the chime on startup.
I have tried repairing disk permissions, resetting the PRAM/NVRAM, re-installing OSX and the whole toothpick in the audio port thing.
I dont really want to have to take it to apple but I dont have any options left. My mac is pretty old, so i dont feel it is worth spending loads of money on it should the motherboard need replacing or anything similarly costly.
Has anyone else had similar problems, or a solution?

One more suggestion.
    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.
Best.

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One more suggestion.
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Best.

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Try the following: I
nsert the earphone jack several times.
Blow real hard into the audio output port. Use compressed air if you have it.
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also, before i fixed this, i couldn't turn the volume up or down (unless i was using headphones) and the volume level screen that shows up on the screen had a circle with a line thru it...like the no smoking signs, but small and just under the volume bars.
http://discussions.apple.com/thread.jspa?messageID=3700681&#3700681
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Internal speakers not shown in sound output, no audio jack red light

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