I got an old Mac Mini from a friend, i think they got it from their workplace after they upgraded to new computers. But it's still locked, and I've tried everything. I can't do much not even knowing the build version of OS it has (I can only assume 10.5 or 10.6 due to when it was originally abandoned) I tried burning an OS disk and booting to it, but the drive refuses to see the disk at all. I tired booting into recovery mode, but the mac doesn't respond and continues booting (So it isn't OS X Lion). I've been trying to reset it in the command prompt (Single-User) but again, nothing as it either says file not found or unknown command. I noticed with the videos showing how to do this the command line is something like :/ Root# Where mine shows as localhost:/ root#, clue maybe? It was at an elementary school so I'm sure it was networked and has protection on it. I'm at a loss and have no experience with Macs, all of my other computers are Windows. Help please!