Locked-out: "You can't upgrade this version of Mac OS X because a newer version is installed
Absolute rookie move. Bought a Mac Mini server (June 2012 model) on E-bay and it came with the previous owner's log-in account still on it. Tried to re-install 10.6 server software with the CDs that came with it but got the message "You can't upgrade this version of Mac OS X because a newer version is installed". Any advice on how I can fix this? I'm hoping I didn't buy a brick that I can't do anything with.
Any help is much appreciated.
~LJ
Mac mini, OS X Server