Sound Output through external speakers not working

For some reason, the sound output to my JBL speaker system that is connected through the headphones jack of my iMac has cut out. When I go to the Sound Preferance panel, under Output, my choices are :
Internal Speakers
Soundflower (2CH)
Soundflower (16CH)
I have NO idea what these Soundflower things are, and don't see a standard "Headphones" option, which is the jack they are plugged into. I also don't see a way to delete these Soundflower "devices".
The sound output not working seemed to happen after a power outage in my building, so I'm going to try a powerreset of the iMac, but still not sure what is going on with this Soundflower stuff.

/System/Library/Extensions/Soundflower.kext and restarting your computer uninstalls Soundflower.
To remove preference panes, context-click on the preference pane's icon and select the Remove option.
https://getsatisfaction.com/cycling74/topics/how_to_uninstall
Long shot, but...
Open Audio Midi Setup in Applications>Utilities, see the input & output options & KHz setting there, some things will change it for their own use, then not set it back.

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