Keyboard not working until after login

If you continue to get the same problem after login at a later date give this a try: boot into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. Reboot normally and test again.

NOTE: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files

Hi HypnoTerence,

Thank you for posting in the Apple Support Communities. Being able to use your keyboard is definitely important, and we'd like to help out with this.

To verify, your keyboard only works on the login screen if it's connected directly. Is that right?

It sounds like this may be a third-party keyboard. Is that right?

As a test, it might help to try booting into safe mode to rule out possible software causes for this. If the Mac doesn't appear to start up in safe mode, that would also be helpful information. Here's How to use safe mode on your Mac. Let us know how it goes.

Best wishes.

Try tapping the Delete key a few times to wake it up. 

Be sure to mark my answer as "Solved" to properly close this thread.

Thank you!