Ok, so I decided to clean the fans of my out of warranty MacBook Pro mid 2014 15". Before doing anything (like disassembling the fans) I disconnected the battery connector and started the cleaning (with a very soft brush). I accidentally misplaced the screws on the left fan by putting 4.4 mm T5 Torx screw in place of the 3.9 mm T5 Wide Head Torx screw. Now the mac looks dead. No light on the magsafe, no power on no nothing.
Does anyone know if the threads for the screw go all the way out of the motherboard or i just destroyed some layer of the motherboard ?