OS X thinks computer is running off UPS when it's not

When I plug the USB cable from an APC Back-UPS Pro 500 uninterruptible power supply into my new iMac, I immediately get the warning from OS X that my computer is running off the UPS and that I need to save my work and shut down. The status bar icon also lists "UPS" as the power source. This leads in short order to the computer shutting down.
OS X is clearly recognizing the UPS (the selector drop-down box in Energy Saver appears when I connect the USB cord), but isn't seeing that the UPS is running fine off of normal power. It's not a problem with the cord (I've switched it out), nor with the connection (I've plugged it both into a hub and into the iMac itself), nor with the UPS (it worked fine with a PC yesterday.
What ought I to do?

if you are relying strictly on what you see on Settings>General>Usage>Storage>Manage Storage - and to do not use iTunes with your iPad - you might not be seeing something critical that can be using up the storage space on your device. It may be that "other" data is taking up all of the storage and you can only see that when the iPad is connected to your comouter's iTunes.
THere are many web articles that describe ways of getting rid of a large amount of "other" data. Take a look at these.
http://www.howtogeek.com/194292/what-is-other-storage-on-an-iphone-or-ipad/
http://www.imore.com/what-other-storage-category-iphone-and-ipad-and-how-fix-it
http://osxdaily.com/2013/07/24/remove-other-data-storage-iphone-ipad/
You cannot get rid of all of it and you don't want to get rid of it all because it is data that you need. It should never be a large amount like 10 GB. If it grows too large, that usually indicates something has gone corrupt on the device and sometimes the only way to bring it back down to where it should be is to restore as new.

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OS X thinks computer is running off UPS when it's not

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