I have a computer account for a Windows 2003 server - not running Powershell. I inadvertently joined a second computer to the domain with the same name and messed up the computer account in the domain. The error when trying to RDP is the domain controller is down or the computer account cannot be found. We do not know the administrator password or password of any local account. I've tried the Reset Computer from the AD GUI, also Delete and Add back. Join says there is no trust relationship. I do have some AD object backups and restored the computer object at time prior to the mishap -- it didn't help.
What can I do to get back into the is computer? I don't understand how the object updates, could perhaps a more precise domain object restore help. I do have other backups?