I think it stays going but will have to try again to see. Have it off to the side for other projects. Will try later tonight hopefully
Sounds like it isn't latching, likely a broken trace, could be a dry solder joint, possibly a bad chip, but it usually isn't. There is a description of how the soft power works on older macs here :
How much alcohol does that require? (Consults slide rule...) I think it would need more than a whole 16 ounce bottle to fill a tub to a depth of a few mm for submersion. A lot :) I try to recycle the alcohol as much as I can. Got used to recycling for 3d resin printing. I keep my general...
68kmla.org
You probably won't need it, in fact I'd say it is more distracting than useful as you're probably just looking for a crusty trace near the battery, U46 or possibly U52, but find attached 8100/110 schematics. Page 16 is of interest.