Optical out does not work on my new 2011 Mac Mini I use the optical out on my new Mac Mini to play high quality music over a separate D/A converter and a class A amplifier. This worked fine with the previous Mac Mini revision.

Now, when I connect the most recent mac Mini with HDMI to a TV set (for watching movies) and at the same time connect optical out for music, the music channel is dead. The read line on the optical cable is on, but the D/A does not receive any signal?

The selection in the system preferences for Audio can be toggled between HDMI and optical out, but does not give any result.

The only option I now have is to use the headphone out with an analog signal into my amplifier, but with a loss of quality.
New macs have 90 days of free phone and online support. Do get the hardware checked out since the optical switch in the port could be faulty or need cleaning from shipping debris.