The Powerbook G4 power button functions like a reset button if you hold the power button in for a few seconds until the computer powers down.
Press and hold down the "Shift" key immediately after you hear the start-up tone. Release the "Shift" key when the gray Apple icon appears on the screen.
SOURCE: powerbook g4 15 not turning on
Something is wrong with the operating system. If there is a flashing folder with a question mark, then it might be with the hard drive as well. If you just get that warning, then you may only have to reinstall your operating system (OS X). Get your CD/DVDs out and insert the OS X disk. Hold down C when you start the computer so it will start from the disk and not from the hard drive. After the startup program has loaded, you can try to check the hard drive and repair permissions and such to see if that works, or you can just reinstall the OS. Good luck.
SOURCE: how to reset the master password for g4 mac powerbook ?
1. Obtain a Mac OSX install disc (buy one from apple or try Ebay)
2. Insert the disc then click on the "Install Mac OS" icon. Then click the restart button.
3. DONT INSTALL! Just click through enough of the windows to get to the regular set of choices on the menu bar. One of those choices is UTILITIES and one of the choices there is RESET PASSWORD.
Simple, but you should know that anyone with a Mac OSX install disc can gain access to your computer.
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