Aha! THAT power button, looked more like a reset button to me. Never touch the stuff. I normally use an ADB KBD's Power Button, but . . . :

My 150 powers on when I flip the switch on the Power Strip, I'll have to try that "power switch" on the back of the 150 again . . .

. . . didn't seem to do anything when I tried it, so I've been ignoring it. :I

Found a great page for service manuals: http://www.tim.id.au/blog/tims-laptop-service-manuals/