Aporte original por: Zachary Lunte ,
If neither the keyboard or the trackpad are working it’s generally a sign that the trackpad or the trackpad ribbon cable is damaged. Since you replaced the trackpad, I’m guessing the trackpad ribbon cable is the culprit. You can see the cable in step 6 of this [guide|24755|guide]. They are easy to damage, but fortunately they are fairly cheap and easy to replace. If you see any pockmarks or cuts when inspecting the cable this would reinforce this theory. Anyway, I hope this helps!