If this is the Blue and White G3 tower, before installing OS X 10.4 Tiger, you need to run a Firmware update for this Mac. Not sure how to locate this for you on Apple's website because any older links to the firmware updated software no longer work.
You need this firmware update.
PM G3 (Blue and White) Firmware Update 1.1
IF your PowerMac G3 is a beige G3, the highest OS X version you can install without special helper software is OS X 10.2 Jaguar.
OS X 10.3 Panther can be installed with the help of this app. OS X 10.3.9 Panther is really, real world end of line for OS X versions to be installed. OS X 10.4 Tiger will not work with beige color PowerMac G3 models.
http://eshop.macsales.com/osxcenter/xpostfacto/