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I'm having this issue since morning. Certain keys on my keyboard don't work when I try to type in my password. A few work and others don't. So I went on safe mode and changed it to no password.

The problem is that my keyboard works perfectly once I've logged into my MacBook Pro. I can type this entire paragraph properly but only only the login screen my keys don't work.

What is wrong with my MacBook Pro?

  • What version of macOS are you using? And have you tried resetting the PRAM and/or SMC? – Bob Dec 2 '16 at 22:40
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I would reset both the System Management Controller and PRAM/NVRAM.

Reset the SMC

Instructions for resetting your System Management Controller (SMC) will depend on whether your MacBook Pro runs from a built-in battery or a removable battery.

As your question doesn't provide the exact model, use the relevant instructions below:

SMC 1 - For MacBook Pros, MacBook Airs, and MacBooks where you can’t remove the battery on your own (i.e. it's a built-in battery), here’s what you do:

  1. Shut down your computer
  2. Keep the MagSafe adapter (power cable) plugged in.
  3. Press at the same time shiftoptioncontrol (on the left side of the keyboard) and the power button
  4. Let go
  5. Turn your computer back on with the power button.

SMC 2 - For MacBook Pros, MacBooks etc that you can remove the battery from, here’s what you do:

  1. Shut down your computer
  2. Disconnect the MagSafe plug (power cable) from the computer
  3. Remove the battery
  4. Press the power button for 5 seconds and release
  5. Put the battery back in
  6. Reconnect the MagSafe cord (or power cable)
  7. Turn your computer back on with the power button

Reset your PRAM/NVRAM

Older Macs had what's called Parameter RAM (PRAM), newer Macs use Non-Volatile Random-Access Memory (NVRAM). It may be worth you also resetting this. Here’s how to:

  1. Shut down your machine. Yes, a full shut down, not just logging out.
  2. Press the power button and then press the commandoptionpr keys. You have to make sure you press these keys before the gray screen appears or it won’t work.
  3. Hold those keys down until your Mac reboots again and you here the startup chime.
  4. Let go of the keys and let your Mac reboot normally.

Note: When you log back in you may need to readjust some of your system preferences (e.g. mouse speed, time and date/timezone, etc).

Give these a go and let us know how you go.

2

I figured out the issue, which seemed to occur due to a video game I would have running when I shut the laptop. Because it (the video game) was in fullscreen mode, apparently the cursor and keyboard input were still functioning through the game rather than the login screen.

Pressing Cmd-Tab to cycle windows changed my keyboard/mouse over to the login screen. Even though it wasn't actually visibly changing screens, the cursor would disappear and reappear each time I pressed those keys.

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