Database connection string with open error

SQL Server Authentication Connection strings string str= "server= server name; database= database name; uid= login name; pwd= login Password";

or string str= "data source= server name; Initial catalog= database name; User id= login name; password= login Password ";
Windows Authentication Connection Strings String str = "server= server name; database= database name; Trusted_connection=ss

Yesterday a careful to turn off the operation of the database service, today open the database connection when the report

SQL Server 2008 Logon error: Unable to connect to (local)

The specific solutions tested are:

Open SQL Server Configuration Manager

Open the SQL Server service

To start SQL Server (MSSQLSERVER)

Start the SQL Server Agent