New 2008 R2 DHCP server will not hand out IP addresses

We've recently migrated our Domain Controllers to 2008 R2, Virtual Machines. (DC3 & DC4).
DC2 is an older 2003 box, 32 bit, set for retirement.  All former roles have been moved to DC3 & DC4, including FMSO roles, and the server (DC2) has been demoted.  The only service that remains on DC2 is DHCP.
I've used NETSH to export / import the DHCP info to DC4.  All reservations have transferred ( Printers) and the scope shows "active" on DC4 and authorized, and running, but whenever I shut DHCP down on DC2, DC4 doesn't start handing out
IP addresses to clients.
Even after rebooting a client multiple times, running ipconfig /release & /renew, it never finds the new DHCP server, nor does the server show any client information in the address leases. (other than reserves)
We have a Cisco ASDM deployed, but DHCP and DNS are both disabled on this device, so I'm not sure IP Helper would be an issue here.
Since both my new DC's are 2008R2, do I need to elevate active directory up to 2008 function before DHCP will work?

Hi,
Is the issue resolved? As suggested by
Wyatt Miller, you can check if it was caused by IP helper.
In addition, is the new server authorized?
Here is a migration guide for you:
Migration of DHCP Server from Windows Server 2003 to Windows Server 2008
http://blogs.technet.com/b/teamdhcp/archive/2009/02/18/migration-of-dhcp-server-from-windows-server-2003-to-windows-server-2008.aspx
Hope this helps.

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    *https://support.mozilla.org/kb/Firewalls
    See also:
    *http://kb.mozillazine.org/Browser_will_not_start_up

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