Aporte original por: Rrien ,
Had the same issue - trackpad and keyboard not working on MacBook. Power button was. External trackpad and keyboard worked fine. Decided to try to open the back of the laptop to see if I could figure something out, but before I could cry about not having the right screwdriver, I saw a tiny piece of paper sticking out of the vent. Used a vacuum to suck it out and voila! Everything is working fine again!