I have spent the past two days trying to solve this issue. Suddenly my QB 2018 does not start.

I tried to follow all the suggestions captured above but I was not successful.

I tried to open and existing file, I tried to re-initialize, I re-installed QB and so on.

I cannot even open a sample file. The attached is what I get and then gives me Error -6175,0. I run the QuickBooks File Doctor which discovers that "* QBDBMgrN not running on this computer." I checked in the services and it was stopped. I tried to start it manually but it Stops immediately. I have no logs to go by so I am stuck.

Please, where do I get from here?
Thank you