Software :: Need To Reset Master Password

I recently purchased a used imac g4 from a friend but I cannot seem to get it started. I tried to log in with the master password but do not have the password or install disk for OSX. I asked my friend about it and he said the same thing, he lost the user and master password including install disk. I took the comp from his hands anyway, it's in new condition and he never really used it, just forgot about it I suppose.

It also seems that on startup the mac searches for disks and servers, so it could of been a part of a network system? I would like to know if there is a way to get into the bios and reset the whole system without password prompts and all that. Which is the best way to do this? I have the mac osx install disk from my ibook but I tried to boot the disk and it's not booting. I also have the install disk for os tiger and that's not booting either. There must be a super secure lock on the system.