Keyboard A1243 not recognized on Mac Mini late 2018

Greetings razvangeorge.

Thank you for using Apple Support Communities. It seems like there is trouble with the computer recognizing the USB keyboard. It looks like you have already done some troubleshooting to solve this issue. Even though there is a chance that you've tried these steps already, I would recommend you follow every step and let us know if the issue persists.

"Steps for a USB keyboard

First, check your device's USB connection. If the tips on that page don't fix it, try these steps:

1. Unplug all devices from your computer, including any connected mouse, keyboard, printer, scanner, camera, iPod, external hard drive, and hub.
2. Some devices, like iPod, might require you to perform steps before it's safe to unplug them.
3. Plug your keyboard and mouse back into your computer firmly and securely. Make sure that the connector is completely in the port. (USB plugs fit into ports one way only, and won't plug in if you try to insert them upside-down.)
4. If you have a Magic Keyboard or Magic Keyboard with Numeric Keypad, also make sure that your Lightning to USB cable is securely connected to the Lightning port on the back edge of the keyboard.
5. If your keys still don't work, try plugging your keyboard in to the other USB ports. Be sure to try them all. Check to see if the keyboard's Caps Lock light turns on when you press it, and try typing in an app like Notes or TextEdit.
6. Magic Keyboard and Magic Keyboard with Numeric Keypad use a Lightning to USB cable. Make sure that the cable you're using is the one that came with the keyboard, or is a Lightning to USB cable that you know is in working order. You can try a different Lightning to USB cable to test whether the cable is causing the issue.

Other tips for fixing issues with your USB keyboard:

• If your keyboard works in one of your USB ports but not all, your computer might need service.
• If your keyboard doesn't work in any of your computer's USB ports, your keyboard might need to be replaced.
• If your Apple Keyboard with Numeric Keypad isn’t charging your iOS device, plug your charging cable directly into a USB 2.0 or 3.0 port on a computer that’s on and not in sleep mode."

If your Apple keyboard doesn't work

Please don't hesitate to let us know if the steps resolved your issue or if you need additional assistance.

Take care.