I can't turn the volume up or down on my MacBook Pro?

I can't turn the volume up or down on my MacBook Pro? It shows a kind of "stop" sign? I can get the speakers to work by connecting my headphones to the computer and choosing the sound to be on the speakers, but as soon as I take the headphones out, I can't get any sound out of the speakers..
Sometimes there is a "Red" light coming out of the AUX-port?

Hey vgamborg,
Thanks for using Apple Support Communities.
This article should help you troubleshoot issues playing sound from the built-in speakers. Try the steps listed, and I quoted a part about the red light.
Troubleshooting issues with no audio from built-in speakers on Macs
http://support.apple.com/kb/ts1574
Check to see if a red light is lit in the line-out port. If so, your Apple computer may need service.
Have a nice day,
Mario

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