Server name changed wrong way, can't revert.

Hi all,

I'm in need of help with the host name change on server. Its a DC built on Server 2003 R2, my colleague changed the computer name from computer properties instead of using netdom.

Obviously it didn't change anything else in AD and now domain services are mostly unavailable. I was trying to change the name back in many ways but it always return: "Tha account already exist"

I have scanned whole AD with dsquery and the only object where the old server name is used is:

"CN=OLDNAME,CN=Domain System Volume (SYSVOL share),CN=File Replication Service,CN=System,DC=domain,DC=local"

Can anyone help me to change the server name back, please. I'm very desperate.

Many thanks in advance.

Tovigo