How to set default Domain logon for WS2003

We have two servers at work server-01 is a mail server and I gather it is the domain controller. Server-02 is our terminal server. Server-02 used to boot up and log onto the Domain “AMG” automatically. we lost power the other day and UPS failed. Server-02 now boots up and defaults to logging onto itself server-02 in the logon window and not the domain “AMG”. If i use the drop down selector and choose “AMG” and logon its all ok. How can I make the server-02 boot up and default back to “AMG” I have logged on correctly and then rebooted the server thinking it would use last domain logged onto as default but this failed.