sd card reader stopped working. Fix?

Hello royalwench,

Thank you for reaching out in Apple Support Communities. If you're referring to the SDXC card slot on your Mac mini unable to read. your SD card, we suggest to restart your Mac in safe mode. This helps to verify the startup disk, deletes some system caches and more. Once you're in safe mode, please restart the Mac as normal and test the SDXC card slot. If needed, here's how to restart the Mac in safe mode:

Apple silicon

1. Shut down your Mac.

2. Turn on your Mac and continue to press and hold the power button until you see the startup options 

window.

3. Select your startup disk, then press and hold the Shift key while clicking “Continue in Safe Mode.”

4. Log in to your Mac. You might be asked to log in again.

Intel processor

1. Turn on or restart your Mac, then immediately press and hold the Shift key as your Mac starts up.

2. Release the key when you see the login window, then log in to your Mac. 

3. You might be asked to log in again. On either the first or second login window, you should see ”Safe

Boot” in the upper-right corner of the window.

These steps are outlined here and it may help the issue you're experiencing with the card reader: How to use safe mode on your Mac - Apple Support

We look forward to hearing back from you with an update.

Kind regards.