Certain key on keyboard (numpad 4) doesn't work

Hello alanparma,

Welcome to Apple Support Communities. We understand that your number 4 key is not working on your Mac mini.

Although it doesn't sound like this impacts other keys and numbers we would recommend starting with the troubleshooting from If a numeric keypad doesn’t work on Mac.

Next, check to see if you have any Accessibility options enabled and test with them disabled if possible. Check out Use the Accessibility Options panel on Mac.

If the same happens or if you did not have any Accessibility features enabled, try using your keyboard in another user account and see if the same thing happens. If you do not already have another user account, you can set up another using the guidance from Set up users, guests, and groups on Mac.

Have a great day!

Hey Alanparma,

Since this does not occur in another user account that may mean there is an issue with a login item. We recommend removing those from the user account that is having issues, then testing again. Find those by going to Apple menu > System Preferences, click Users & Groups, selecting your user name, then clicking Login Items at the top of the Window. Remove all Login Items, then check to see if the same thing occurs. If this resolves the issue, you can then add one login item back at a time and see which one impacts your keyboard performance.

Thanks!