my laptop keyboard keeps typing automatic letters P at login window

Oct 15, 2018
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while starting Dell laptop login window - password get automatically typing with p alphabet
also screen casting window appears automatically at right side of screen
 
Try connecting an external keyboard and see if works then. If it works fine, then the attached keyboard either has a damaged key or something stuck in it that is making it type on its own. If there is nothing to remove (debris, dust, etc.) then you may have to replace the keyboard.
 

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