Is my digital output broken?

[-::ubermann::-]

I have a Core Duo macbook, when I plug the toslink it doesn't emit any red light from the audio jack.
I checked in system preferences/sound and there is the option digital out of type built-in output enabled, same in DVD player the option is selected as well, when I plug it with my home theater it won't play anything, again not even the red light appears.
I've read that a common problem is that the digital output isn't desactivated even when there is no toslink plugged in, maybe this is the reverse problem? will inserting there a toothpick work?
What can be done to have it fixed?

 

[UltraNEO*]

I have a Core Duo macbook, when I plug the toslink it doesn't emit any red light from the audio jack.
I checked in system preferences/sound and there is the option digital out of type built-in output enabled, same in DVD player the option is selected as well, when I plug it with my home theater it won't play anything, again not even the red light appears.
I've read that a common problem is that the digital output isn't desactivated even when there is no toslink plugged in, maybe this is the reverse problem? will inserting there a toothpick work?
What can be done to have it fixed?

I don't think the Mac automatically detects a Toslink cable. I know you can activate it by go into your sound control panel and select the output as Optical - the option won't be there unless the cable is attached.