copy/paste not working on apple keyboard

This is driving me bananas!  Anyone know why an Apple keyboard would all of a sudden no longer be able to copy and paste text using keyboard Cmd+c, and Cmd+p?  I am using OSX El Capitan. Problem appeared about a week ago.
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SeanSystem EngineerCommented:
go to Keyboard settings in System Preferences and:

Restore defaults Modifier Keys
Restore defaults in Shortcuts tab
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