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DeltaV Runtime Database refuse to start in MMS workstation

Dear All,
I’d be grateful if you give me systematic approach to solve this problem.
One day we are seeing in Diagnostics - DeltaV  that MMS DeltaV application station not Communicating,
when we tried to access to MMS workstation for some reason DeltaV Runtime Database refuse to start,
and timer countdown for 2 mins 30 sec of DeltaV initialization (Status : Waiting for Service to start [150] ) .
When we tried to start AMS Device Manager from Pro-Plus workstation , after click on AMS Device Manager icon, nothing appears.

I don't actually know what has gone wrong because this has not happen to these system before.

Any help will highly be appreciated.