My sister just bought an original iMac for her grandson to use. She gave it to me cause she couldn't get the CDROM to work. Just booted it up and found it was the property of a school and has some special menu software on it. I'm pretty sure this is blocking the use of the CDROM. So I've decided to format and install OS9 on it fresh. I don't know shit about OS9. Are there other versions of it or just one? If there are other versions, what's the latest version I can use? Any chance I can use the OS9 install disc that came with my PowerBook?