stuck on mouse picture
I was upgrading to Sierra OS and it got stuck. So I turned it off and back on. Now all I get is two pictures, one is a ouse one looks like a computer
Mac mini (Late 2014), iOS 11.0.3, upgrade to sierra
It sounds like what you're seeing is a standard alert when Mac cannot find your mouse and keyboard.
Try the troubleshooting steps here:
If your Apple wireless mouse, keyboard, or trackpad isn't working as expected - Apple Support