Built-in speakers not working

Please help;
Built-in speakers not working after using audio port to run remote speakers.
I tried using the FAQ in iTunes to solve problem. Built-in speakers will not play sound.
Under system prefs., sound, the device shows; Digital Out under port; Built-in Output
Under settings for the selected device;
The selected device has no outpt controls.
When I adjust volume the sound level meter shows level on high but cancelled out (circle w/ slash).
I notice RED LIGHT from inside sound port. Sound works when headphone are plugged in but not external speakers.
thank you for any advise.
Steve

Check out this post...
http://discussions.apple.com/thread.jspa?messageID=3827290&#3827290

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