Macintosh Powerbook G3 will not turn on at ...

Hi, Sorry to hear you are having problems,
OK, let's try this, #1, remove the battery, be sure the mac is powered down and the power cord is connected to the Mac and a power outlet.
Press firmly down on the power on button for a solid second then release it.
That should start it up.
If it does work, you can safely insert the battery now operate the mac normally...
If this does not work, is it possible that your stepson eh, may have spilt some liquid into or on the Mac? A small amount of saliva in the wrong place could Kill a mac.... Just a thought..

Have you considered that your laptop just might have died and your stepson being developmentally disabled or not had nothing to do with it, just a a disabled persons thought.