Unlock keyboard, the keyboard and the mouse are not working
the keyboard and the mouse are not working
[Re-Titled by Moderator]
iMac 21.5", OS X 10.11
If your wireless keyboard and mouse are not working?
see > If your Apple wireless mouse, keyboard, or trackpad isn't working as expected - Apple Support
If that support article, does not get the keyboard and mouse working?
You can use most any generic or windows USB keyboard and mouse with your Mac.