Database login Password login can not do?

I am using the SQL server2008 database, the login name originally created is SA, but the password is forgotten. Later, I first opened the MSSQLServer service in the console to see if the service was not opened, the command was: cmd (into the console), start net MSSQLServer (open MSSQLServer service), stop net MSSQLSERVER (shutdown service ), after the service is open, if the password is still not logged in, then use the window to log into the database , find security, check the login name, and finally modify the password, check whether the other state is enabled. Finally, a reboot is OK.

Database login Password login can not do?