Realign the power supply. You should hear a definitive click.
Great job on this write up. Made the job less painful.
Just an update - I have the late 2014 model and it works fine.
I ageee. When it popped loose I thought I broke it. My retaining clip disappeared but that plug is very tight.. it’s not budging. Take the time to make sure it’s aligned properly - there are little indents in the top and bottom of the case. You’ll know it’s right if you don’t have to fight it.
Even with the tool - it takes more force than you think. There are clips on both sides of the board. Be aware of that when putting it back.
This is a pain in the arse to get back on. Lock the screw down first when reassembling.