Mac Mini/HDTV Audio Problems

I have my Mac Mini connected to my Samsung HDTV. It worked fine and I had audio and video. Somehow, the audio stopped. I hired a professional to come and reconfigure my whole setup and he connected the Mac Mini to our home theater speaker system. It worked, fine. Now, it does not have audio. He and I have tried everything and there is no sound, but there is sound when the computer is not connected to any audio. You can hear the sound come from the computer, and you can hear sound when you connect earphones. The RCA connectors that hook to the microphone outlet will not work with the computer. What am I doing wrong? There is sound...it just will not let my TV or speakers hear it.

Given a pro could not fix it, it isn't easy to troubleshoot this sort of thing over a forum but, let's see if you can adapt from my experience with the Bravia. I am not a pro, hence tolerate my 'elementary' explanation.
1. A DVI-HDMI cable is connected from the Mini to the HDMI input on the LCD with the little audio jack beside it. Only this HDMI input, that partner's the audio jack, is relevant.
2. An audio cable is then connected from the Mini's mike jack to the audio jack beside the HDMI input. This arrangement settles audio on the LCD speakers.
3. To output audio to the 5.1 Receiver (via the LCD), I chose a channel on the LCD, in my case 'TV' ('Sat' was also available). From the 'TV' channel, twin Red/White RCAs are connected to the corresponding 'TV' channel on the 5.1. This settles audio to the 5.1 as well.
4. Turn on the LCD, select the relevant HDMI channel for the Mini and you have audio on the LCD speakers.
5. Mute the LCD speakers. Turn on the 5.1, select the 'TV' channel (on the 5.1) and there you have it, audio on the 5.1.
Hope this helps
Cheers

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