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n your case just add the new server to the domain, run dcpromo on it, assure to check GC and DNS during promotion and after replication has occurred start demoting the old OS DC.
Demoting the old DC
- transfer the FSMO roles from the old DC to another one, either all on one or divided, doesn't really matter
- reconfigure your clients/servers that they not longer point to the old DC/DNS server on the NIC
- to be sure that everything runs fine, disconnect the old DC from the network and check with clients and servers the connectivity, logon and also with one client a restart to see that everything is ok
- then run dcpromo to demote the old DC, if it works fine the machine will move from the DC's OU to the computers container, where you can delete it by hand. Can be that you got an error during demoting at the beginning, then uncheck the Global catalog on that DC and try again
- check the DNS management console, that all entries from the machine are disappeared or delete them by hand if the machine is off the network for ever
- also you have to start AD sites and services and delete the old servername under the site, this will not be done during demotion
