maybe that way:
How to boot PPC PowerMacs (G3, G4, G5) from a USB stick or drive? - Macintosh Repository
To boot any* PowerPC Mac (e.g. an iMac G3, an iBook G4, a PowerMac G5, etc...) from an USB stick or drive, FIRST know that if your model is 300mhz or...
www.macintoshrepository.org
