Keyboard and trackpad do not work properly. Stuck at login page.

I have the same problem, my trackpad click seems not working in the login screen but I can move the cursor. I use the keyboard arrow keys to navigate the focus and press enter as alternative for click. Then I was able to enter my password and login. And my trackpad click starts working again. It just dont click in the login screen, I don't know why.

Arnel 의 2017년 4월 15일

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Dan @danj

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When you depress on the track pad do you feel the click action? If not I suspect your battery has swollen. So the pressure is preventing the button from depressing as it is being held down now from below pressing up.

You can test this by disconnecting the keyboard and trackpad ribbon cables internally from the logic board and using USB connected keyboard & mouse. You will need to use a jumper to startup your system off of the logic board as the power switch will also be disconnected. In any case you'll need to have the battery out as well here.

Follow this IFIXIT guide: MacBook Unibody Model A1278 Logic Board Replacement. Follow the steps to Step 5, then jump to Steps 15 & 16 which are the keyboard & track pad cables. You don't need to go any further. Now plug in the USB keyboard, trackpad and power adapter. In Step 15 you can see two square solder pads just above the trackpad cable connection. carefully short these pads to turn on your system. At this point your external keyboard & mouse should allow you full access.

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Thanks guys,

I removed the battery. It didn't work at first, I tried to press harder on the keys and all of a sudden both the keyboard and trackpad work again as usual.

robbb 의 2015년 1월 10일

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I have the same problem, my trackpad click seems not working in the login screen but I can move the cursor. I use the keyboard arrow keys to navigate the focus and press enter as alternative for click. Then I was able to enter my password and login. And my trackpad click starts working again. It just dont click in the login screen, I don't know why. — Arnel
Thanks guys,

I removed the battery. It didn't work at first, I tried to press harder on the keys and all of a sudden both the keyboard and trackpad work again as usual. — robbb