W2003 only showing local login

We have a main NAS box here which now only shows the local login screen (No domain drop down box). The server is still a member of the domain here (shares etc work from it fine) and oddly going via LANDesk we can still logon normally (The domain drop down is then available).

Unfortunately no one know’s the local admin account password. Also if I create a new local administrator I can’t logon with that account either.

If anyone has seen anything like this before or has any bright ideas I would be glad of the help.

Regards

Ian