Macbook no longer recognizes Spdif cable

All of a sudden my macbook no longer sends anything through the built in optical output. Analog audio works just fine but it doesn't seem to recognize the optical cable anymore. It worked fine earlier this week, but now somehow it's dead. Theres no light from the cable and in the audio pref pane it says it's outputting through headphones and there obviously is no sound.
Does anybody know anything about this problem? I have never had problems with optical output before so I'm clueless.
macbook black   Mac OS X (10.4.9)  

Use a data recovery product such as the ones listed here, and then get a replacement drive.
(110354)

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