Chosen Solution
Hi! I have installed a new topcase on my Macbook Pro (a1278) mid 2012. Before installing it, the computer worked fine without a keyboard (I would usually remove the battery and power it on with the magsafe cable, since the keyboard wasn’t working). Then I replaced the topcase (with Keyboard, no trackpad) and now the computer doesn’t turn on. I tried powering it on with the magsafe and even with the Logicboard’s power pads and nothing. I have attached a picture in case anyone has any suggestions? Thank you!
This has been fixed after I put the rear/bottom case back on the MBP. I assume I had a cable poorly connected and it seems that puttng everything together solved it!
Your photo shows the battery is not plugged in.
