Accidently Delete Machine

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Can anyone tell me how to restore a machine that was accidently deleted from
server. If he unplugs his machine (RJ-45) he can boot his machine normally,
then plug in his RJ-45 and access internet. If he tries to boot machine,
when plugged into RJ-45, he gets error. His machine no longer shows under
server. If he tries to set up new machine, and use wizard to attach
computer, he gets message back that this machine is part of domain already.

Any advice on how to restore the old machine name? Thank you in advance.



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