Help- Mac Book Pro built in speakers wont work.

Hi. I just turned on my Macbook Pro today and found something funny. My internal speakers will not work and when i try to use the volume keys the display comes up for volume but it has the do not enter icon. i plugged my headphones in to see if it worked and it did. i also noticed that there is a red light coming from my headphone jack when the headphones are not in it. Does anyone know how to get my speakers working again?? I looked at the help files and it says to make sure that internal speakers is checked in the : system preferences->sound->output. but all there is to check is: digital out.
Please help. Thank you very much

Check to make sure that digital out is NOT selected - your headphone port is also a optical digital audio port - hence the red light.
When you plug in headphones, your computer knows that there are headphones attached and routes the audio accordingly, allowing you to use the built in volume controls. When the audio out port is set to Digital Out, your MBP thinks that there is some other digital device plugged in (with its own volume controls) and so disables the MBP's internal volume controls and internal speakers.
If you have checked that Digital Out is not selected, you may want to try a permissions repair, and possibly a PRAM reset (Hold  + Alt + P + R when you restart your MBP - before the grey screen).
Someone with more experience of optical ports may have another solution - obviously there isn't anything stuck in the port, so it must be a software issue.

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