Issues regaining clients after original AV server bit the dust.

Folks, I'm having an issue with our Symantec Endpoing 12.1.1000.157 system.  Recently our old AV server went and died, hardware failures and all.  We recently regained our management server again and have connected it back to the domain and am able to see all the OU groups that we had before.  What we are having issues with is the Client computers themselves are not reporting to this new Management console and I am unsure of how to get them to connect back.

Any information anyone has would be greatly appreciated.

Thanks

Greg