Mini audio out gone silent

I have a Mid-2011 Mac mini connected to an external amp via a digital connection.
I was listening to a track in iTunes and the audio went silent.
At the moment, I can get audio out of the speakers in the thunderbolt display.
I cannot get any audio from the audio out socket - either via a digital connection or with analogue earphones.
Any thoughts or suggestions?

Well, it's working again now.
I took the mini apart, pressed down all the connections, shook the motherboard a bit, and it's working again.
I can't imagine there was anything wrong with the mini; probably an external connection problem resolved by unplugging and replugging everything yet again.

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Mini audio out gone silent

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