I hooked up my old Mac to my new Mac via Firewire so that I could manually copy over applications/files. Somewhere in the process, my new computer created a second account that has the same wallpaper/doc icons as my old computer. I think that when I set the old computer to “target disk mode”, my new rig had to recognize it as an entity of some kind, and therefore created a new account based on the old rig. Every time I boot up, I have the option of logging into either account.
When I view accounts in my system prefs, the “old” account is grayed out so I can’t edit/delete it. Is there another way to get rid of it?