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Your gonna need an OSX Leopard disk if you need to wipe the HD.
But if you just create a new user, and the switch to it, and then delete the "old" user account, you can have an almost new installation without the need to reinstall.
Now if there is some problem with the installation, then you will need the disk. OSX Leopard (10.5) is the newest mac os you can install on a PPC mac.
Good luck....
Thanks for the info. I figured it being PowerPC it wouldn't support anything past Leopard.