There is a light, if it is an SPDIF incide headphone jack. But it should turn on only if the headphones are connected.
Look in the User Manual if there is really a SPDIF in your version of MacBook.
There is a light, if it is an SPDIF incide headphone jack. But it should turn on only if the headphones are connected.
Look in the User Manual if there is really a SPDIF in your version of MacBook.