Cannot connect to database master at SQL server.

Hi There,

I have installed SQL Server 2012 and Sharepoint 2013. I'm at the point where it has launched the configuration wizard. We get the above error when clicking next at the point of creating my Datadbase Server and name on the Specify Configuration Database Settings and get the error 'Cannot connect to database master at Sql server at XXXX. The database might not exist, or the current user does not have permission to connect to it. I tried to investigate this and done the following using previous posted threads:-

1. Turned off Windows Firewall
2. Tried local Administrator
3. Tried domain login
4. Enabled TCP/IP in SQL Server Configuration Manager
5. Stop/Started all SQL services and then even rebooted
6. Ensure that Agent and Browser services were started
7. I added my domain account at the SQL installation stage so I logon to the server and opened SQL manager and gave my self dbcreator and security and server admin rights
8. Launched Sharepoint wizard but it still fails with the same error

Is there anything else that I can try? Please help

Regards,

Mao