Domain Controller gone doo daa

I have 4 servers on a site I am being forced to look after, 2 tse's and 2 domain controllers. One of the domain controllers, the one with Domino installed on it crashed a number of months ago. It was rebuilt from a backup tape according to Microsofts guidelines but now when I go to Active Directory/Operations master the server is not listed as being there or able to take control over the domain. It was there before, and I think this is casuing some major replication problems. Any help great or small will be appreciated here.

 

Make sure all of your operations masters are owned by one of the servers. If not, seize the roles to the server that was not rebuild. Also make sure you have at least 1 GC, but I would recommend having both DC's and a GC since your organzation is so small.
Make sure DNS is working properly and all resource records are listed. Then run a program on from the admin tool kit on the Win2k CD called dcdiag and netdiag.
It will tell you what is wrong with your domain at that point.
If you still think you have replication problems, check a program called repmon that also comes parts of the admin took kit on the Win2k CD for assistance.