The number one cause of database connectivity issues is when the instance in SQL is stopped. This can automatically happen when any Windows Updates are run on a PC. To resolve this issue follow the below steps.
Launch SQL Server Configuration Manager by going to the Start Menu, All Programs, Microsoft SQL Server 2008 R2 (or similar, depending on the version installed) and select SQL Server Configuration Manager.
Alternatively, on Windows 10, browse to your Start Menu, when you start to type a search bar will appear. Type one of the following two, these will vary depending on the version of SQL installed.
SQLServerManager10.msc
SQLServerManager11.msc
At the top of the screen you will see the application, select return on your keyboard or select the option from the screen using the mouse. The following screen will appear.
Here you can see 3 items. Note: RELATE may show as (RAPLOCAL) depending on your setup.
SQL Server (RELATE) – Should always be Running
SQL Server Agent (RELATE) – Should always be Stopped
SQL Server Browser – Should always be Running
In this case, SQL Server (RELATE) is stopped, this needs to be running.
To resolve this, right-click on the instance and select Start from the menu provided.
The following screen will appear, the instance is now starting.
When the instance has started it will appear on the Configuration Manager with 'Running' beside it
You can now close Configuration Manager and launch DRIVE, the login screens should now be available.