Your preference file may be corrupt and deleting it may resolve your issue. When your computer restarts, test your keyboard again.In any case, restart your Mac normally.When your computer is in Safe Mode, test your keyboard, is it working now?.Safe Mode can take up to 10 minutes so be patient. Keep holding the Shift key until you see the login screen.Turn on your Mac and quickly press and hold the Shift key.Other macOS versions: Launch the App Store on your Mac and click Updates.ħ.If there is an update available, click the Update Now button. If your current macOS version is Mojave or later (e.g., Catalina): On your Mac, go to Apple menu > System Preferences > Software Update.

Keep holding the keys for about 20 seconds.Turn on your Mac and quickly press Option, Command, P, and R keys together.Please see that article on how you can reset the SMC.ĥ. If this is a Mac Notebook, the steps are a little different.Now start up your Mac by pressing the power button.Shut down your Mac by choosing Shut Down from the Apple menu.If it is, resetting the SMC is very simple. It is highly likely that this is a desktop computer.

Your USB port may be having a power-related problem and resetting the system management controller (SMC) can fix your problem with your keyboard. What you can do is to try replugging them one by one until you find the device that is causing the problem.Ĥ. If you can use your Keyboard now the problem may be with one of the other devices. Now reconnect your keyboard and mouse back into your computer. These can be a mouse, keyboard, printer, etc.

Disconnect all connected devices from your Mac.

Ensure that there is not anything (debris, dirt, etc) obstructing the connection in the USB port.

Unplug your keyboard and replug it into your Mac firmly and securely.

Switch the keyboard’s cable to another USB port on the same Mac, if possible.

It is possible that your Keyboard is not properly connected to your computer. Open the battery part of the keyboard and check to see if the batteries are placed correctly. Check your keyboard batteries if applicable. To restart your Mac, click the Apple menu > Restart.Ģ. Your keyboard is the main mode of input.Īfter each step please test to see if your keyboard is working:ġ. This is an important problem because you will not be able to use your Mac without a keyboard. If you see an error message, your keyboard keys suddenly stop working, your Mac is no longer recognizing your USB keyboard and you can’t figure out why this article will help you fix your problem. This article explains how you can fix when your Apple USB keyboard isn’t working as expected.

2017 mac pro usb using too much power