Left. Right, Up, Down Arrow keys not working in Windows 11/10 PC? Check the USB port, verify battery, run Keyboard Troubleshooter, re-installer driver, etc.

However, if you are stuck at the login screen because some of the keys on your keyboard aren't working, you can use Windows' on-screen keyboard to log in.

As a result, the large Shift key is now my new up arrow key, and the old half-size up arrow key no longer has a function. This solution provides me with full-size up and down arrow keys, before and ...