Let’s Apply Bellow Solution As per your problem To get fixed keyboard & mouse not working issue on windows 10.
This is cause we need to fix Windows App Related problems. And the second scenario keyboard working smoothly but Unable to type anything, keyboard input not working on start menu /Cortana search or edge browser web bar it didn’t display any input letters. This is mostly software problem or system file corruption issue. First keyboard light is on but unable to type anything keyboard totally not respond to any command.
There is two scenarios for this Keyboard input not working issue.
