Power button? :?:

APS-17adp-The fourth AC adapter, 17 W, came with PowerBook 150 computers, and works with PowerBook 100 or 150 computers.Warning: Using an AC adapter that produces more than 19 W with a PowerBook 100 or 150 computer will damage the computer's logic board.

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I think I've found my PB100's replacement AC Adapter:

Apple Low-Power AC Adapter - Model No: ADP-17AB REV. A 7.5V x 2.0A = 15W

The first one's tip chipped and lit up the MoBo. All was replaced under an extended warranty arrangement.

So, I'm sitting here with three rope lumpen and not a single one spec'd at 17W for use with the PB150. :/