Tosliink Digital Audio MBP

Hey, I bought a toslink adapter, so I could play 5.1 surround through my MBP. When I hook up the adapter and the cable to my surround system, the computer does not recognize that I have it plugged into an external source. System Preferences reads that a digital audio is connected; however, it is as if there is no device plugged in. I checked to make sure that the receiver was on the correct setting for the input, and I cable when it was plugged in to the computer and not the receiver, and there was a red light, so the computer is giving out a signal. Any ideas would be appreciated. Thanks.

ok, since this prob comes up every week and often more than once a week, I wrote a detailed explanation and saved it so I could repost it next time it happened to someone. here it is:
the audio input/output connector on all mac notebooks is a dual function connection. it can switch between analog and digital optical. the way it does this is by an automatic sensor that detects what is plugged in. if it detects that an optical digital cable is connected, then it will switch to digital output and/or input mode as the case may be. this is why you see a red light - it's the optical digital audio stream. it seems that in many cases, people's connectors are becoming stuck, and the machine thinks there is a digital optical cable plugged in. it can happen if you've connected or disconnected headphones, or speakers, or possibly even if something is loose in that port and it just gets jammed with the sensor being tripped. people have suggested trying to gentle poke inside the port with a paperclip, to try and reset the sensor back to the setting that nothing is plugged in. for some people it has worked, for others, not. you can also try plugging in headphones and unplugging them a few times to see if it does the trick. if none of this works, then unfortunately the best bet is going to be taking the machine in for a service.

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    ok, since this prob comes up every week and often more than once a week, I wrote a detailed explanation and saved it so I could repost it next time it happened to someone. here it is:
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