Thanks for the immediate reply. The machine2 is identical machine with same hardware configuration.
<b>Dkk When you built the other DC did you assign the same Administrator password to this new DC as the old one?</b>
I am not familiar with the tool MarvinSterling has posted here. You can always give it a test run to see what you gain from it.
Likewise here is an Article that you should read and cross reference with what you’ve already tried. <a href=”http://technet.microsoft.com/en-us/library/cc782127(WS.10).aspx”><b>Restoring a Domain Controller Through Reinstallation and Subsequent Restore from Backup</b></a>