At this point, since it won't boot from either Mac OS 9 or Mac OS X, unless you have an external Firewire hard drive with the appropriate OS installed, I see no way to get your PB working without having an installation disk for either 9 or X. Sorry, but unless someone else can think of a trick I'm not coming up with, you're probably stuck until you can get your hands on a set of install disks, either for Mac OS X or the original system CDs.