Something has gone wrong with the SQL Server and when the SQL Engine service starts this appears in the event log:
An error occurred while processing the log for database 'model'. If possible, restore from backup. If a backup is not available, it might be necessary to rebuild the log.
and when I try and connect to the instance I get this:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 2)
What can be done?