Incorrect SQL server instance name somewhere but can't find where. Causing errors.

Hi,

I am using Critical Path Training's PowerShell scripts to build a new SP 2013 Farm. They reference 'WINGTIPSERVER' as their SQL DB Server for all the SQL server instances in their scripts. I replaced these with the name for my own SQL server but obviously I have missed one out somewhere before running a script to build or configure a service/application as I am getting the following errors and it mentions WINGTIPSERVER (which doesn't exist):

Event viewer:

Unknown SQL Exception 53 occurred. Additional error information from SQL Server is included below.

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)

ULS log:

Unknown SQL Exception 53 occurred. Additional error information from SQL Server is included below.  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) 

SqlError: '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)'    Source: '.Net SqlClient Data Provider' Number: 53 State: 0 Class: 20 Procedure: '' LineNumber: 0 Server: '' 

ConnectionString: 'Data Source=WINGTIPSERVER;Initial Catalog=Master;Integrated Security=True'    Partition: NULL ConnectionState: Closed ConnectionTimeout: 15

System.Data.SqlClient.SqlException (0x80131904): 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) ---> System.ComponentModel.Win32Exception (0x80004005): The network path was not found     at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, UInt32 waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection)     at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)     at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection)     at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions)    at System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource`1 retry)     at System.Data.SqlClient.SqlConnection.Open()  at Microsoft.SharePoint.Utilities.SqlSession.OpenConnection()     at Microsoft.SharePoint.Utilities.SqlSession.ExecuteReader(SqlCommand command, CommandBehavior behavior, SqlQueryData monitoringData, Boolean retryForDeadLock)  ClientConnectionId:00000000-0000-0000-0000-000000000000

SqlCommand: 'SELECT name FROM sys.server_event_sessions WHERE name LIKE 'SharePoint_Diagnostics%' and startup_state=0'     CommandType: Text CommandTimeout: 30 

Failed to Sql Query data XEvent collector on WINGTIPSERVER. The error is 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)

I have no idea where to look to correct the SQL instance name. Which service or application is wrongly configured here? Can anyone please help?

Thanks