Optical out/internal speakers no longer work

Hello,
I was wondering if anyone could help, my macbook now believes that there is an opitcal lead in the jack all the time - and so the internal speakers no longer work, i can plug in headphones and the optical but when everything is removed then no speakers - its just set at optical out.
any ideas would be most welcome as i would rather not spead money on repair or just it sent off for ages - thanks
craig

when you turn the machine on with nothing in the audio out, do you get a startup sound?

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Audio output changed to 'Digital Out' and speakers don't work! Please help!

I'm not exactly sure what's happened, but after starting up my macbook pro, my speakers/audio haven't worked.
The volume control in the menu bar is inactive (looks light grey) and in the Sound menu, I have no option for output devices except for 'Digital Out' - there is no other option for 'external speakers' (as per usual) or anything!
I can plug earphones in, and sound comes out fine... I don't know what may have happened, but I'm really worried - I use my MBP for home & work; I need my speakers to work!!
If anyone can offer any advice, I'd be really grateful. Thank you in advance.

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Optical out/internal speakers no longer work

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