I can’t log into my iMac because it is not connecting to my keyboard
How do I reconnect my keyboard from the login screen?
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What model iMac do you have? Which model and version of the keyboard do you have? Is it wired or wireless? If you have one of the Apple Wireless Keyboards that is recharged by connecting a USB to Lightning Cable to the port on the back of the keyboard then you simply need to connect the keyboard to your computer and make sure that the keyboard's power switch is turned on. This will connect the keyboard via USB and, if the keyboard isn't already paired for Bluetooth use it will take care of that too.
This Apple article will help you identify which keyboard you have:
How to identify your Apple wireless mouse, keyboard, or trackpad - Apple Support
This article will help with the setup of the current Apple Wireless Keyboard model:
Set up your Apple wireless mouse, keyboard, and trackpad - Apple Support
And this article provides keyboard troubleshooting assistance:
If your Apple keyboard doesn't work - Apple Support: