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Aporte original por: panpan ,

Texto:

Thank you to @jesan90 and @Denny Glover.

My keyboard and trackpad worked at login screen, and stopped working after logging in.  I tried all software fixes and gotten no result. Then I opened the back cover, took out the battery and unplugged the trackpad flex cable. I  saw some ports had turned black. I wiped it with alcohol, put everything back together. Then it worked!

I was searching for how to assemble a MacBook and found this video. This guy had the same problem and did a demonstration of how to change the trackpad flex cable. In my case, I didn’t have to change the cable, simply wiping the ports with alcohol fixed the problem.

https://www.youtube.com/watch?v=BGPsUTWGqqg

Estatus:

open