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If characters are repeatedly displayed
In the Keyboard Viewer, make sure the characters displayed correspond to the characters you press on the keyboard.
In the Keyboard Viewer, check whether there are any icons displayed in gray. If so, a key may be stuck in the down position.
If you have another keyboard, try using it. If characters are not repeatedly displayed with the second keyboard, the original keyboard may not be working correctly.
See alsoUse the Keyboard Viewer