How to solve a login problem of SQL Server?

There are two possible ways to solve it:

　　1) a way of cmd command:

　　　　Step 1: Run cmd( as Administrator);

　　　　Step 2: Type in "net start mssqlserver" and press Enter;

　　　　Step 3: Enjoy SQL Server now.

　　2) a way with mouse click:

　　　　Step 1: Right click at the "This computer" icon on your desktop or at the "This computer" tag on the left in any explorer window;

　　　　Step 2: Choose the "Manage" menu;

　　　　Step 3: Double click the "Service" on the function tree;

　　　　Step 4: Find "MSSQLSERVER(SQL Server (MSSQLSERVER))" and right click at it;

　　　　Step 5: Choose start;

　　　　Bingo!

　　Sometimes, the "SQL Server (MSSQLSERVER)" service will not run properly, just start or restart it may solve many problems.

- This is a note I wrote on Aug. 10th, 2015. Many syntax mistakes may occur in the passage, but this is a milestone to me. Keep going!

How to solve a login problem of SQL Server?

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