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Q: USB keyboard inputting random symbols

I got a used USB Apple Keyboard today. I plugged it into my MacBook Pro (late 2013 running OSX 10.9.5) and at first I was getting no input at all, then it suddenly started typing numbers/symbols at random without any keys being pressed. This is what it looks like:
Screen Shot 2016-09-11 at 4.43.52 PM.png
I've tried all of the troubleshooting suggestions here: http://www.makeuseof.com/tag/trouble-apple-keyboard-heres-fix/ But none of them have worked. The computer recognizes the keyboard, but none of the keys that I press respond to anything. When I'm not touching it at all, it just keeps inputting these random numbers.

Does anyone know what might be going on here?

MacBook Pro (Retina, 15-inch, Late 2013), OS X Mavericks (10.9.5)

Posted on Sep 11, 2016 1:46 PM