Macbook speakers not working

Hi,
I just got an old used macbook from my office. I am working on it now. Though it is old, I love working in it.
One day, I inserted my iPod's headphone into the headphone jack of macbook. After listening to some tracks for some time, I removed it from macbook.
Now I dont get any sound from the macbook built-in speakers. The volume control on the top panel is disabled (I mean its in gray color, i cannot do anything with it).
When I press F5 or F4 (Volume Up and Volume down), there is symbol (kinda crossed circle symbol) is coming. Also, some red light is glowing in the macbook headphone jack. I am not able to listen any track from built in speakers.
I am now able to listen to sound only using a headphone. Sound with headphone all the time is paining. Please help. I am new to macworld and my employer just gave me a beautiful mac and I want its built-in sound speakers back.
Thanks

Your audio optical switch is stuck.
http://discussions.apple.com/thread.jspa?messageID=4258241
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