Before You Begin
This section provides procedures for removing and installing the components in your desktop. Unless otherwise noted, each procedure assumes that the following conditions exist:
•You have performed the steps in “Turning Off Your Desktop” and “Before Working Inside Your Desktop” in this section.
•You have read the safety information that shipped with your desktop.
•A component can be replaced
The procedures in this section may require the following tools:
•Small
•Phillips screwdriver
•BIOS executable update program available at support.dell.com
Turning Off Your Desktop
CAUTION: To avoid losing data, save and close all open files and exit all open programs before you turn off your desktop.
1.Save and close all open files and exit all open programs.
2.Click Start 
→ Shut Down.
The desktop turns off after the operating system shutdown process finishes.
3.Ensure that the desktop and any attached devices are turned off. If your desktop and attached devices do not automatically turn off when you shut down your operating system, press and hold the power button for at least 8 to 10 seconds until the desktop turns off.
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CHAPTER 5: INSTALLING ADDITIONAL OR REPLACEMENT COMPONENTS