Exchange 2010 don't see its PDC (same machine)

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http://serverfault.com – I have two 2008 R2 servers which should replicate AD. One si production server, second backup. On primary server is also Exchange 2010. There were plans about a year ago to install exchange to backup server to to replicate and serve as backup in case primary server is unavailable. My former colleague completed first two steps (or may be just one) in Exchange install as presented by exchange installer (I think it has to do something with AD integration and redistributables installation). Today I accidentally broke backup server (probably bad drivers) and from the moment backup server went down, (HowTos)