Can't get Exchange 2010 to connect to AD on Server 2008

I completed a migration which has been going smoothly until last night when I demoted the original SBS box. Even though I have another DC which all systems point to for DNS, GC, etc. it still says unable to locate the domain when attempting to log in to a system. Also, Exchange 2010 won't find it either....Please help.
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zequestionerAsked:
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Suliman Abu KharroubIT Consultant Commented:
time and date on server ?
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AustinComputerLabsCommented:
Did you uninstall exchange on the old sbs box before you demoted?

Have you removed any references to the IP address for the old SBS box on, DHCP, IP config on static addresses?
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zequestionerAuthor Commented:
yes, I have removed all pointers to the SBS box.
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zequestionerAuthor Commented:
date and times are ok as well.

followed this link to a T:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2881-Migrate-Small-Business-Server-2003-to-Exchange-2010-and-Windows-2008-R2.html

Bombs out on the last part of step 13 where we uninstall exchange. Even though its DNS was pointing at the new DC and the new DC is a GC, it kept saying it couldn't find the domain. so we ran dcpromo /forceremoval and now are unable to access any active directory services.
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AustinComputerLabsCommented:
So were you succesfull at "Step 11 - Uninstall Exchange 2003 from Small Business Server 2003"?
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Cliff GaliherCommented:
At this point an ipconfig /all from both the client and the new server would be helpful. Scrub any significant info (replace domain with "domain" etc, but keep IPs intact if possible.)

-Cliff
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madhatter5501Commented:
Have you tried resetting the computer to workgroup, then back to the domain, and mapping the dns to the DC?  I am not sure if this is even possible, but maybe worth a shot.
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Viral RathodConsultantCommented:
The ADTopology Service should detect the new GC,The exchange server should be registering a 2080 event every 15 minutes in the app log ,All the available GCs will record on the event

Otherwise to set a static list have a look at:
http://social.technet.microsoft.com/Forums/en/exchange2010/thread/1f012f8a-76cb-45b9-b6c9-6f95d857e3c4 
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zequestionerAuthor Commented:
After an expensive call with Microsoft they discovered that our domain controller had stopped advertising itself as a domain controller. It advertised GC and other roles, but not DC. (and was the only DC in the domain.) once this was fixed, everything else followed suite.
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zequestionerAuthor Commented:
Resolved by MS.
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