USB keyboard not recognized after 10.12.3 update

Question

This morning I accepted the 10.12.3 update.

After a long install and reboot I attempted to log in.

However I was unable to enter my password as it seems the keyboard was not working.

I disconnected the keyboard and then a bluetooth keyboard setup window popped up.

I shut down (Hard), plugged the keyboard back in and started up again.

Ziltch.

This is the second time this has happened after an update.

I think last time I got it to work by disconnecting all USB devices except the keyboard and rebooting.

Posted on Feb 1, 2017 8:43 AM

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Answer 1

Level 10

685,311 points

Have you tried disconnecting everything?

Try a SMC reset. The article covers when this is required, but doing this will not affect anything.

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Answer 2

SMC reset didn't help.

What worked was removing all USB devices while powered down, then powering up and then connecting the keyboard.

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Answer 3

I finally got it to work again by plugging in my external dvd drive to the port, removing it, and then plugging the keyboard back in.

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