Mac mini optical audio failure

Hi, I ask for help regarding a problem that is affecting me about my Mac Mini 3,1 with Lion 10.7.1 connected to an amp with optical cable Sony HT minitoslink -> toslink.
Until a few days ago, everything has always worked perfectly. In these days, after turning on the mac mini, the audio comes easily to the amp, so I can see DVD movies and MKV in multichannel audio mode. After about 10 minutes, while the video continues, the sound stops. I try to restart the mac mini but the problem remains.
In addition, when i disconnect the optical cable from the amplifier side, the red light is not present. If I link a headphone to macmini or set-up to internal speaker analog audio works fine.
If I turn off the mac mini and power back up after fifteen minutes, the optical digital audio back, but it turns off after 10 minutes.
I tried to connect the cable to another macbook: it works regularly and the red light is turned on regularly for some time.
I did a clean install of Snow Leopard 10.6.7 on a USB drive and unfortunately there are the same audio issues.
In your opinion can be a problem with cable or there is a problem on macmini sound card?
I tried to reset the PRAM and SMC, permission repair, delete audio preferences, but nothing changes.
I also tried the Apple Hardware Test and the Apple Diagnostic Disk and the result is okay.
Can you help me?
Thank you for your attention

Hello, I solved the problem. I moved the Mac mini in a ventilated place, then I turned it on and I put the headphones into the "audio out". I restarted the computer three times, then I put the optical cable and everything works as before!
The CPU temperature was 72 ° C. I used the software smcFanControl and the temperature dropped to 52 ° C. I think the Mac Mini overheats so much. Now is okay, I have seen many movies in Dolby Digital and DTS.
I hope that you solve the problem.
Goodbye!

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