I have a MacBook Pro (early 2015, 13"). About a year ago, the keyboard and trackpad quit working. I took it to the Apple Store and they said it could be that the cable went bad. They also said they may have to replace the whole bottom casing. I figured if it was just the cable, it would be worth me fixing it by myself. I'm not the most experienced MacBook mechanic, but I generally know what I'm doing.
Anyway, I've been using the MacBook with an external mouse and keyboard for a year. I bought a new cable for the trackpad, but after the replacement the MacBook won't even turn on. I switched back to the old one and it still won't turn on. What could have gone wrong? I've unplugged and replugged the battery, used two different power cords, etc..