crwdns2934241:0crwdne2934241:0 Michele Carlo

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No startup chime/audio greyed out on late 2009 Mac mini?

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On my late 2009 Mac mini (Lion 10.7.4) the audio is randomly greyed out without any startup chime. In System Preferences/Sound/Output, no audio output device is shown.

What could be the problem?

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Mac mini Model A1283

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open