#external power button
MacMini A1347
some models seem to not work with the 10K resistor. 4.7K and 8.2k worked too.
MacBook Pro A1398
Mac Mini Late 2014 needs a 1k resistor on one of the button cables, otherwise mac mini gets a hard shutdown.
http://www.insidemylaptop.com/turn-on-macbook-pro-laptop-without-power-button-locating-power-on-pads/ https://www.ifixit.com/Answers/View/144531/power+on+pads+on+A1398