My startup chime suddenly stopped working.

I have 2011 27 inch iMac. (Mavericks 10.9.4) The startup chime suddenly stopped working this morning. I have not changed any software or hardware recently and there is nothing plugged into the headphone jack. Tried resetting SMC and PRAM and still no chime. Machine appears to be working normally other than this. Any idea what could be going on? Thanks, John.

Might be worth doing SMC and PRAM resets - there are instructions linked in one of the posts in this discussion: https://discussions.apple.com/thread/3695933?tstart=0
~Lyssa

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