Event ID 1005 in the application log is often accompanied by the problem of the System Attendant not starting.
Domain Name System issues. For example, DNS may not be configured correctly on the Exchange server. This is particularly possible if there is more than one Network Card on the server.
System Attendant Service configured to start with some other account and not the Local System Account.
Exchange Domain Servers Global Security Group may be missing, may have been moved to another container, or may have permissions on it modified.
File and Print Sharing may be disabled. NetBIOS over TCP/IP may be disabled.
NetBIOS TCP/IP Helper Service may be disabled.