My iMac Keyboard reproduces key function symbols in the screen and get blocked.

The function keys: fn, ctrl, alt, cmd reproduce their respective symbol in the screen, in white and make a sound as typewriter. The computer responds in rare ways. If a tyepe the key two more times the symbol disappears and the computer works well again

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Sigurdur ArmannssonConnect With a Mentor Designer Commented:
Most likely you have accidentally activated Universal Access.

Check out: System Preferences > Universal Access > Keyboard. Put Sticky Keys and Slow Keys to Off.

Also check out: System Preferences > Keyboards > Universal Access. Turn off keyboard shortcuts you know you will never use.
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