New domain controller setup in existing DC

I need to setup a 2012DC in an existing 2003 domain, and then make the 2012Dc the primary. My question is that the vendor who built this DC put a domain on it already. so I need to remove that domain entirely before joining the existing domain. what is the process of this?
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Joseph MoodyBlogger and wearer of all hats.Commented:
You would demote it and check the "this is the last domain controller in this domain box".

However, if I had this problem - I would probably wipe the machine and reinstall the OS. I like a completely clean configuration for my servers.

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As Joseph has stated...

1. Open Server Manager.

2. From the Manage menu option, choose '[b]Remove Roles and Features[/b]'.


3. Deselect '[b]Active Directory Domain Services[/b]'.


4. Complete the remaining steps in the Active Directory Domain Services Role Wizard.

Evan HinesCommented:
I'm with Joe just wipe and reload! also make sure your 03 box is at an 03 function level.
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AmitIT ArchitectCommented:
What do you mean by put the DC on 2012? Is it in use by users? You need to review properly, why vendor built new domain and then take proper action.
Will SzymkowskiSenior Solution ArchitectCommented:
I would agree, wiping the OS would probably be the best method here because you do not want to have any remnats from the other domain the machine was added to. It does not take long to load the OS and promote the server as a DC.

Make sure that you have a 2003 Forest and Domain functional level, and also preping the Forest/Domain before you add your 2012 server as a DC.

You could just reload the base OS and repromote the DC into the existing domain. If this is the only DC for the 'wrong' domain and if it's not actually in use, then that's a quick fix. Demoting the DC first might be cleaner if there are other DC's or systems that already know about the 'incorrect' domain. Anyway you first need to find out if the domain is already in use or not and then take action depending on the answer.
AmitIT ArchitectCommented:
Enable netlogon and review the netlogon logs for a day or so. If you don't see any traffic, then shutdown 2012 DC for one or two days, if no issue report, then you can proceed with decom and reinstalling steps.
350ztnAuthor Commented:
its not in use. I just powered on the server and noticed it was a new domain. I spoke with the vendor and they didnt know you could migrate from 2003 to 2012. I guess I will just reload the OS. I was hoping to do this remotely instead of being onsite...but reloading OS does make sure it is CLEAN, as I don't want any remnants.
2003 is at 2003 level, checked that already.
Thanks fellas.
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