I can start it now.
The power switch wasn’t dead, the power button, the bit of plastic that hits the switch, was.
After removing about 5x as many parts as I needed to in retrospect (it all went back, no left over bits), I pulled the button, and so now I directly tap the switch ……… I just need to use a screwdriver or eraser end of a pencil.
I’m going to set up an appointment with the computer shop, so that I don’t have to wait a week for parts.
Might have them add some memory too.