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One day my MacBook Air mysteriously remapped the 'U', 'I' and 'O' keys to all be the alt/option key. I've no idea what triggered this, I took it to the apple shop and it seems to stay that way when they did the hardware test. Does anyone know why this could be, and hopefully recommend a way of fixing it?

  • Does an external keyboard work OK? – Tom Gewecke May 25 '18 at 1:36
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Try resetting the NVRAM and the SMC on your Mac then test those keys and see if they are still remapped.

NVRAM aka PRAM https://support.apple.com/en-us/HT204063

How to reset NVRAM

Shut down your Mac, then turn it on and immediately press and hold these four keys together: Option, Command, P, and R. You can release the keys after about 20 seconds, during which your Mac might appear to restart.

On Mac computers that play a startup sound, you can release the keys after the second startup sound. On iMac Pro, you can release the keys after the Apple logo appears and disappears for the second time.

SMC (System Management Controller) https://support.apple.com/en-us/HT201295

How to reset the SMC on Mac notebooks

First, determine whether the battery is removable. Most older Mac notebooks have removable batteries. Mac notebooks that have nonremovable batteries include MacBook Pro (Early 2009 and later), all models of MacBook Air, MacBook (Late 2009), and MacBook (Retina, 12-inch, Early 2015 and later). Learn more about Mac notebook batteries.

If the battery is nonremovable:

  1. Choose Apple menu > Shut Down.
  2. After your Mac shuts down, press Shift-Control-Option on the left side of the built-in keyboard, then press the power button at the same time. Hold these keys and the power button for 10 seconds. If you have a MacBook Pro with Touch ID, the Touch ID button is also the power button.
  3. Release all keys.
  4. Press the power button again to turn on your Mac.

If the battery is removable:

  1. Shut down your Mac.
  2. Remove the battery. If you need help removing the battery, contact an Apple Authorized Service Provider or Apple Retail Store.
  3. Press and hold the power button for 5 seconds.
  4. Reinstall the battery.
  5. Press the power button again to turn on your Mac.

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