Hi all, I'm a staff member at my local pawnshop (Cash Converters) and as our mac "expert", it's been left up to me to make sure that any apple products that we purchase are working properly. We have recently purchased an iMac G5. Upon testing it appears that this computer was part of a network system and as such all administrative functions are locked. I'm unable to access System Preferences, change any setting in Applications, install anything or generally do anything you want to be able to do on a computer. I have the OSX10.4 installation discs but am unable to open the installer or even access boot from disc functions (holding "c" during startup) or single-user mode. I would like to know if there is a way to force a re-install or something to setup the computer from scratch, thereby getting rid of any network admin passwords and such. The contents of the system are not a concern and the store has full legal ownership of the computer Any help would be appreciated.