Removing a server in the Domain Controllers OU

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?
PCAAdminAsked:
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wantabe2Commented:
you need to first, demote this server if you are going to remove it, then wait about 20 minutes then go into your forward DNS zones & reverse zones & manually look for that netbios name. If it is still there remove it. This should take care of your ping issue. I've seen this many many times.
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PCAAdminAuthor Commented:
How do I demote the old one?
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PCAAdminAuthor Commented:
Does the dcpromo have to be done from the server your demoting?
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wantabe2Commented:
Yes
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PCAAdminAuthor Commented:
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 & reverse zones not the new name. Not sure if I should edit the name in the DNS zones & 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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