Dell Studio 1558 (Early 2010) - Manual (Page 100)

100
Shutting Down Your Computer
2 Click Start and then select Turn Off menu.
3 The Turn off computer dialog box appears.
4 Click the Turn Off button to shut down the computer.
NOTE:
Windows operating systems start automatically when you turn on the
computer.
HINT: If your computer is not operating properly, restarting Windows
often solves the problem.
FOR MORE INFORMATION: To learn more about turning off your
computer properly in Windows, see Windows Help and Support: click
Start
or → Help and Support.