External JBL speakers no longer work

I downloaded an update for itunes and now my external JBL speakers no longer work. They do not appear on the list of options under system preferences for sound. What do I do to get them back, they worked fine till the update.

This could be something as simple as the plug not being fully pushed in. I have had my speakers/earphones non functional after working behind my iMac. The speaker plug in each case had been jostled loose. This happens too easily for my liking, but now I know that if my sound is out or routed to the iMac speaker, the first thing I do is reach behind and push the speaker plug in more firmly.
I hope this is all it is...
Griff

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