Before You Begin
This section provides procedures for removing and installing the components in your laptop. Unless otherwise noted, each procedure assumes that the following conditions exist:
•You have performed the steps in “Turning Off Your Computer” and “Before
Working Inside Your Computer” in this section.
•You have read the safety information that shipped with your computer.
•A component can be replaced
Turning Off Your Computer
CAUTION: To avoid losing data, save and close all open files and exit all open programs before you turn off your laptop.
1.Save and close all open files and exit all open programs.
2.Click Start 
→ Shut Down.
The laptop turns off after the operating system shutdown process finishes.
3.Ensure that the computer is turned off. If your computer did not automatically turn off when you shut down your operating system, press and hold the power button until the computer turns off.
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CHAPTER 4: INSTALLING ADDITIONAL OR REPLACEMENT COMPONENTS