Cannot Connect to the Configuration Database- SharePoint 2010

http://community.bamboosolutions.com/blogs/sharepoint-2010/archive/2010/12/17/sharepoint-2010-cookbook-cannot-connect-to-the-configuration-database-error-when-connecting-to-a-wss-2-0-site.aspx

https://www.experts-exchange.com/questions/27181207/Cannot-Connect-to-Configuration-Database-SharePoint-2010.html

Cannot connect to the configuration database” error of central administration

https://mikessharepoint.wordpress.com/2011/11/22/cannot-connect-to-the-configuration-database-error-of-central-administration/