Transfering to another active directory controller

[haapysmurf]

I have been given the task of transfering a windows 2003 domain controller. The current server is low spec and is causing delays. THe company have purchase a new server with more memory etc. They want to use the new server as the domain controller / dns server. We then want to remove the dns / active directory roles off the old server.

The low spec server is a windows 2003 server with the following active directory roles:

Schema Master,Domain naming master, Infrastructure Master, Relative ID (RID) Master,PDC Emulator, global catalog

I have installed Windows 2003 standard on the new server. I have added the dns and active directory roles. Finally transfered the above ad roles by following this ms article

/>http://support.microsoft.com/kb/324801

All works ok, until I shut down the old server. I can not use group policy manager to model a user when the old server is shutdown. Although I can edit the group policies. I believe the pc's are slow to log on when the old server is switched off. I have removed the dns role from the old server. I do not want to remove the ad role until I am sure the new server is working correctly.

DCDiag returns no errors. All my tests so far show the new domain controller to be working correctly.

Does anyone know what could be causing this problem?

Thanks