USB Apple Keyboard not recognised
Recently (possibly since upgrading to OSX10.01.5 but can't be certain) my iMac does not recognise the USB apple keyboard anymore. I had to find a bluetooth keyboard to login. I can see from earlier discussions this has been a problem in the past. The USB ports work fine with other devices. The keyboard works fine with other computers. How can I fix it??
iMac, OS X Yosemite (10.10.5)