Responder a: How to bypass the power button on a 2012 MacBook ProSimilar story from me. My daughter spilled apple juice in my wife's 2012 15" MacBook Pro. I actually dismantled the entire keyboard and cleaned between the membrane layers to clear the shorting from the printed circuits. Unfortunately, when separating the membrane layers, I was not cognizant of the Caps Lock key's LED attached to the membranes and damaged a couple of traces. Now, this Mac won't power on either and I am awaiting a trace repair pen so I can fix it. The trick for now? Perform the power reset that you can find in many internet sources: Disconnect the battery and magsafe power connector. Press the power button for 10 seconds, then while still holding the power button, connect the magsafe connector to your MacBook. Hold the power button for another 10 seconds. At this point, try to start your Mac normally (this never works for me). Next, reconnect the battery connector. This should power on your MacBook Pro. It works for me. Of course, this assumes your battery has a charge :-) You will need to res...