I signed out of all services (iCloud, Messages, FaceTime, etc) with an iCLoud account that i no longer needed or have a use for. I signed in with my new one and reformatted the system a while after. the old Apple ID was not used on a phone or anything etc. So my problem is even on a new install it still bugs for the old apple id and there does not seem to be a way to remove it? Its not signed in at all, but it just is the default username in all iCloud accounts ie; system preferences icloud account or messages. etc.