Optical audio out not working (incl the solution for me)

problem:
new 2011 Mac Mini, 2.5G
connecting to
a) TV via HDMI
b) to a D/A converter and amplifier for a bit better music output
This worked perfectly for my previous MiniMac that I replace due to my need for speed.
Now, I could see some red light at the end of the optical cable, but the D/A box did not recognize a signal?
Furthermore, the Sound switch in Settings would only make the TV play.
solution:
after a lot of troubleshooting at the Genius Bar in Beijing (big thanks for that ... the shop is terribly crowded and they never manage to keep the appointments), we found the optical cable to be faulty .... it was apparently bent too much and still had some throughput but not enough to make the receiver read it.
Nasty one!

I just purchased this exact same receiver (used). Same issue with Apple TV. Anyone ever figure out to make it work correctly? Thanks.  

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