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2002 iMac running Mojave with Apple wireless keyboard

Today, a cluster of characters on the right side of the keyboard (7 8 9 u i o j k l m .) quit working, both caps and lowercase.

To narrow down the problem, I replaced the keyboard with a spare and re-booted. The issue remained, leading me to believe it's not a keyboard problem.

I enabled the keyboard viewer and all keys work when clicked.

SOLVED — The problem was inadvertently enabling Mouse Keys.

  • 2002 iMac? Do you mean a 2012? Try booting in Safe Mode (hold shift while booting). If the issue goes away, it's something being loaded and intercepting those keys. – Allan Jan 19 at 17:45
  • Lots of people have reported this in the Apple forums already, it seems some Mojave installs turn on Mouse Keys by default. – Tom Gewecke Jan 19 at 18:37
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Sounds like you have accidentally activated Mouse Keys. Turn it off

https://support.apple.com/kb/PH18381

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