Power Button Not Working When Battery Attached
I have a mid-2012 13' Unibody MacBook Pro. After a spill, the power button does not work if the battery is attached. I was following the directions to power on from the "power pads" when I discovered that if the battery is not attached, but the computer is connected to AC power the button works just fine.
Short term my solution has been to just never shutdown the MacBook, but I would like to try and fix the problem. However, I am not sure if there is a way to test if the problem is caused by the battery (which is easy to replace), the keyboard (which would mean replacing the upper case), or the logic board (in which case I would probably just live with the status quo).