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How do I demote the old one?
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<a href="http://technet.microsoft.com/en-us/library/cc740017(WS.10).aspx" rel="ugc">http://technet.microsoft.com/en-us/library/cc740017(WS.10).aspx</a>
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Does the dcpromo have to be done from the server your demoting?
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So that would be impossible in my case then. The server was reloaded and the name was changed, and that server is in use. Not sure why the old name is still under the Domain Controllers OU. Also the old name is in use in the DNS zones &amp;&nbsp;reverse zones not the new name. Not sure if I should edit the name in the DNS zones &amp;&nbsp;reverse zones to match the servers new name or not. Why would the old name reply to ping still? If the server was reloaded and has a new name, then only the new name should reply.
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A former employee reloaded our secondary DNS server and renamed it. Now, the old name and the new one both show up in the Domain Controllers OU. I want to remove the old named one but the thing that concerns me is, when I ping the Server Name of the old and the new they both reply with the same IP. What should I do in this case? 
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A former employee reloaded our secondary DNS server and renamed it. Now, the old name and the new one both show up in the Domain Controllers OU. I want to remove the old named one but the thing that concerns me is, when I ping the Server Name of the old and the new they both reply with the same IP. What should I do in this case? 

http://technet.microsoft.com/en-us/library/cc740017(WS.10).aspx

Does the dcpromo have to be done from the server your demoting?

So that would be impossible in my case then. The server was reloaded and the name was changed, and that server is in use. Not sure why the old name is still under the Domain Controllers OU. Also the old name is in use in the DNS zones &amp; reverse zones not the new name. Not sure if I should edit the name in the DNS zones &amp; reverse zones to match the servers new name or not. Why would the old name reply to ping still? If the server was reloaded and has a new name, then only the new name should reply.

Removing a server in the Domain Controllers OU

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).

Windows Server 2003

Active Directory (AD) is a Microsoft brand for identity-related capabilities. In the on-premises world, Windows Server AD provides a set of identity capabilities and services, and is hugely popular (88% of Fortune 1000 and 95% of enterprises use AD). This topic includes all things Active Directory including DNS, Group Policy, DFS, troubleshooting, ADFS, and all other topics under the Microsoft AD and identity umbrella.