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I have a 13 inch mid 2012 MBP, I'm having problems with some of my keys, some of my keys don't work such as u I O j k L m, but the wierd thing is that they work perfectly fine during the login screen, but don't work after logging in

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  • do they work in Safe mode ? Also did you try using the virtual keyboard (on screen)
    – Ruskes
    Dec 6, 2018 at 5:57
  • If you keep the [u] key pressed, does your cursor move?
    – dan
    Dec 6, 2018 at 13:55

1 Answer 1

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Disable mouse keys which is an accessibility function.

Type fnF5, and suppress the check mark there:disable mouse keys

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