OSX - Users cannot login

Hi guys,`
At my workplace we have purchased 20x iMacs. They are the late 2013 model.
I setup OSX Server on one of them, I created my users and they could login. I could make some basic settings in the profile manager.
I couple of months went by whilst we prepped for the project that requires the Macs and today I set them all back up but the users cannot login. I can get in to the local account and see that the server name has a green dot against it. Also, They have a valid IP address.
The server itself is running and is pingable. Open directory has a green dot too. I am not sure what to do. When I set them up I was doing it a little bit blind. I wonder if there is any easy way of deleting the entire server setup and starting again?

At one point today, one of the clients I tried did login.
The Apple setup is also on the inside of a Microsoft Windows domain which is doing the DHCP for the iMac clients. There is a reservation for the iMac with OSX on.
Any pointers would be greatly appreciated.
JackIT ManagerAsked:
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If you have Windows AD domain set up, you don't really need an Apple OD server for network resource access, unless you need that Apple server for some other reason. I can't think of why the login would go away or been weird, but moving them to AD might be a good solution.

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JackIT ManagerAuthor Commented:
Thanks. I have not tried anything with Windows AD. I want to keep Apple with Apple and MS with MS. I need to use the functionality of OSX Server really. I think I may try deleting the Open directory and OSX server and try a reinstallation tomorrow.
James NewportCommented:
Have you checked the time on the server is correct and the time on the clients is correct?
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