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https://social.technet.microsoft.com/Forums/exchange/en-US/62fe9207-4b89-4eb3-b4d6-c4f0f31d8b0f/sql-server-startup-issue?forum=sqlgetstarted
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/0bc5a3bc-a3e8-4c3b-b154-820e81c83b99/login-failed-for-sql-service-account-in-sql-2008-on-windows-2008?forum=sqldatabaseengine
https://serverfault.com/questions/582316/log-in-failed-for-user-error-18456
https://stackoverflow.com/questions/20923015/login-to-microsoft-sql-server-error-18456/37287268
http://itproguru.com/expert/2014/09/how-to-fix-login-failed-for-user-microsoft-sql-server-error-18456-step-by-step-add-sql-administrator-to-sql-management-studio/
https://www.sqlserverblogforum.com/dba/login-failed-for-sqlstate-28000-error-18456-the-step-failed/