How to join domain when computer account exists in different OU

I'm a little confused.  If a computer account exists in a domain, and you have rights to join that computer to the domain, then you can do so.  

If a computer account already exists anywhere in the AD structure, then you can not create a new computer account with that same name.  You just need to use ADUC and move the existing account to to the new OU.

Does that help?  If not, then could you clearify a bit?

I can try and explain a scenario....

TestEB01 exists in the OU:
 "OU=Processing,OU=Desktops,OU=ASDFComputers,DC=DallasMlp,DC=com"

TestEB01 gets re-imaged, and the join domain script on the new image points towards:
 "OU=ProcessingNew,OU=ASDFComputers,DC=DallasMlp,DC=com"

I want the script to join this newly imaged computer to the domain in the "ProcessingNew" OU.

I know that you said that if a computer exists on the domain you can't create a new account, but if the computer is joined to the same OU, my script runs perfectly.

Any ideas on a script that will have a computer join the new OU with no hands on interaction?

Well... since the computer account already exists, you can just run this simple script to move it to the ProcessingNew OU.

Set objNewOU = GetObject("LDAP://OU=ProcessingNew,OU=ASDFComputers,DC=DallasMlp,DC=com")

Set objMoveComputer = objNewOU.MoveHere _
    ("LDAP://CN=atl-pro-03,CN=Computers,DC=fabrikam,DC=com", "CN=atl-pro-03")

It's not that easy though, i don't know for sure which OU the computer will be in, and I don't want to have to create a script for every scenario.

and will just moving the OU join this newly imaged, unjoined server to the domain?

I think you have two seperate issues...  You want a machine computer account moved to a new OU, and you want that freshly imaged machine joined to the domain.  I would use a simple script such as this to join the computer to the domain:

Const JOIN_DOMAIN = 1
Const ACCT_CREATE = 2
Const ACCT_DELETE = 4
Const WIN9X_UPGRADE = 16
Const DOMAIN_JOIN_IF_JOINED = 32
Const JOIN_UNSECURE = 64
Const MACHINE_PASSWORD_PASSED = 128
Const DEFERRED_SPN_SET = 256
Const INSTALL_INVOCATION = 262144
 
strDomain = "FABRIKAM"
strPassword = "ls4k5ywA"
strUser = "shenalan"
 
Set objNetwork = CreateObject("WScript.Network")
strComputer = objNetwork.ComputerName
 
Set objComputer = GetObject("winmgmts:{impersonationLevel=Impersonate}!\\" & _
    strComputer & "\root\cimv2:Win32_ComputerSystem.Name='" & _
        strComputer & "'")
 
ReturnValue = objComputer.JoinDomainOrWorkGroup(strDomain, _
    strPassword, strDomain & "\" & strUser, NULL, _
        JOIN_DOMAIN + ACCT_CREATE)

Then once your on the domain and you have rebooted, use this script to find the computer account you are on in AD and move it to the ProcessingNew OU

Set WshNetwork = WScript.CreateObject("WScript.Network")      'Network Object
Const ADS_SCOPE_SUBTREE = 2

Set objConnection = CreateObject("ADODB.Connection")
Set objCommand =   CreateObject("ADODB.Command")
objConnection.Provider = "ADsDSOObject"
objConnection.Open "Active Directory Provider"

Set objCommand.ActiveConnection = objConnection
objCommand.CommandText = _
    "Select distinguishedName, Name from " & _
        "'LDAP://DC=fabrikam,DC=com' where objectClass='computer'" & _
            " and Name = '" & WshNetwork.ComputerName"'"  
objCommand.Properties("Page Size") = 1000
objCommand.Properties("Searchscope") = ADS_SCOPE_SUBTREE
Set objRecordSet = objCommand.Execute
objRecordSet.MoveFirst

Do Until objRecordSet.EOF
Set objNewOU = GetObject("LDAP://OU=ProcessingNew,OU=ASDFComputers,DC=DallasMlp,DC=com")

Set objMoveComputer = objNewOU.MoveHere _
    (DistinguishedName, "CN=" & Name)
Loop

That is mostly untested, but it will probably give you a good place to start.

that's the script i posted in my question. It's really don't care if the existing computer account is moved or deleted, i just don't want to have any interaction, i needs to be automated so anyone can use it

That option works, but it adds a lot of reboots to our imaging process. Is it possible to lookup and delete the computer account before you join the computer to the domain, then join the computer to the domain?

Keep in mind that you would need to pass the logon credentials because you are not joined to the domain yet.