Active Directory is not working

Occasional Reader

I had microsoft server 2003. i installed 2012 R2 on a new machine and joined the old domain. Then the migration was done by some person and i dont know how he did it.

The old server crashed now and the new one is working. DNS and DHCP are working fine but Active directory is not. 

I am new so can anyone please help me with this. 

I will share the results whatever is required.

 

Thank you.

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