Late '06 Macbook C2D 2.0 2GB ram. Had two of these kept this one because the headphone jack works perfectly for plugging in a 3.5mm plug. My other Macbook the jack was worn out, but the toslink worked great. The Toslink on my current macbook does not seem to send any audio to my stereo. I have a beam of light I have checked all the settings that I know to check. My receiver is in perfect working order, the port works and the cable is undamaged as I have tried it on other devices. The macbook is telling me the optical output is selected. Short version: Light but no sound from toslink? Suggestions?