It was likely tied to a MS AD server, or Apple server (Mac OS X Server or the MacOS Server add-on with Lion and up, probably OS X Server for this era) for login and doesn't have a "local account" outside of an admin account if it expects the school network. Schools, universities, and workplaces do it for security most of the time. It was common in the era when Apple sold the Xserve and even the "server edition" desktops; they were usually the same with a server license outside of Xserve. They still do this, but often use an MS AD server tie to a local user.
In this case, you will likely need to wipe the HD out and reinstall; you'll need to replace the optical drive in this case. However, any 12.7mm IDE laptop drive should work, but the bezel may not transfer unless you have the "right drive". You just need to transfer the bridge board.
If the drive has a jumper switch, most newer IDE optical drives for laptops are to a fixed jumper select mode based on where the drive is in the IDE bus chain. It may or may not matter, but if it does you will need to adjust the hard drive jumper to the master jumper mode so the jumper select mode on the laptop optical drive forces it to be the slave drive. If you force one in the master mode, the other drive in the chain becomes the slave drive. HOWEVER, if you have two drives in the same position then you run into a conflict none of them get recognized; if that occurs, you may need to master the optical drive and slave the hard drive. This will slow your boot times a bit, but it's sometimes the only workaround.
Sostituzione del drive ottico dell'iMac G3 Modello M4984
To burn the CD, just use a standard CD burning program you like.
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