MacBook not turning on after replacing trackpad cable 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..
Listen buddy i have a similar problem. When you changed the ribbon cable you have probably forgot to remove the cable for the battery. This is why probably your battery went wrong. I also changed the ribbon cable myself and managed to unplugged my battery. This however did not fixed my keyboard and mouse issue (wish it did but it did not) but when i tried to turn it on it was just fine. I would suggest you unplug your battery leave it for few minutes check any cables around take off the ribbon cable put it back on. Then plug the battery properly put the protector on and try to start your mac. If that does not solve your second problem then you better start browsing for a new laptop.