I changed a motherboard in my livingroom MD. PCI Bus didn't work. It came up as a new Media Director....
I was going to delete the old MD, but I messed up and deleted the Core's MD :(
Now, can I add the Core's MD manually, or do I have to reinstall to get it back?
Maybe, have a look at: http://forum.linuxmce.org/index.php?topic=2268.0 that might help.