It seems that dust and small particles can get stuck under keys or the spacebar, making them unresponsive.

Because the butterfly mechanism distributes the pressure on a key more evenly than the traditional scissor mechanism, if a spec of dust gets underneath a key it can stop the key from depressing all the way - and that can stop the key from registering.

And according to reports, its not just the keyboard that must be removed but also the battery, frame and ports - a repair that can only be performed by an Apple service professional.

Prior reports indicated that the repair could run to 700 (521) or more, if the warranty had expired.

Apple adds a disclaimer that If your MacBook or MacBook Pro has any damage which impairs the service, that issue will need to be repaired first.

In some cases, there may be a cost associated with the repair.

Another thing I tried was restoring the Macbook Pro to a Time Machine point (I have one backup 45 days old).

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However, the computer works perfectly using an external keyboard and mouse.

Apple says the logic board is damaged due to dust and would set me back 500.

Yes, all the way down, not sleep or logging out.

Press the power button and then press command-option-p-r.

You have to make sure you get those keys pressed before the gray screen comes up or it wont work.

Hold those keys down until your Mac reboots again and you hear the startup chime.

Let go of the keys and let your Mac reboot normally.

You need to hit the keys to reset the pram, and the keys dont work.

After that, my keyboard and trackback become again unresponsive.

Any other suggestions Connected external keyboard and trackback work perfectly.

I asked them kindly if they could check for something inside, to do so they unplugged the battery - (SMC reset) and now I am typing on the keyboard.

Apparently the cable that connects the track-pad and keyboard needed replaced.

The apple genius said it happens frequently enough that he knew right away what was wrong.

They replaced the cable and now everything seems to be working.

FYI - the power button goes through a different connection, which is why it still works.

I dont know if the problem will reapear but definetly the issue is located there.

Mac Keyboard 2017 Cleaner