DNS

Hi all,
My Windows 2000 and NT clients see my Windows 2000 domain as SAMMT. On DNS, the domain name is cngroup.co.uk. I tried to add another domain controller to the Domain. The problem is that it is looking for cngroup.co.uk which it could not find. It can see the SAMMT domain but falls because it says it could not find a domain controller for the domain. The specified domain either does not exist or could not be contacted.
Secondly can somebody email me an example of an SRV records please.