Run srvmgr.exe from run cmd line under this application you should select "View" then select servers, under servers you will see which server is the PDC...it will list as primary, also you should see which is a bdc (backup domain server).
srvmgr.exe is located under server tools under i386 dir on server cd or resorce cd if it isnt on the main 2000 server..... but it should be so all you need to do is run that from the run line