1Before You Begin
Turn Off Your Computer and Connected Devices
CAUTION: To avoid losing data, save and close all open files and exit all open programs before you turn off your computer.
1Save and close all open files and exit all open programs.
2Follow the instructions to shut down your computer based on the operating system installed on your computer.
•Windows 8:
Move your mouse pointer to the
•Windows 7:
Click Start 
and click Shut down.
Microsoft Windows shuts down and then the computer turns off.
NOTE: If you are using a different operating system, see the documentation of your operating system for
3Disconnect your computer and all attached devices from their electrical outlets.
4Disconnect all telephone cables, network cables, and attached devices from your computer.
5Press and hold the power button for about 5 seconds, after the computer is unplugged, to ground the system board.
Safety Instructions
Use the following safety guidelines to protect your computer from potential damage and ensure your personal safety.
WARNING: Before working inside your computer, read the safety information that shipped with your computer. For additional safety best practices information, see the Regulatory Compliance Homepage at dell.com/ regulatory_compliance.
WARNING: Disconnect all power sources before opening the computer cover or panels. After you finish working inside the computer, replace all covers, panels, and screws before connecting to the power source.
CAUTION: To avoid damaging the computer, ensure that the work surface is flat and clean.
CAUTION: To avoid damaging the components and cards, handle them by their edges and avoid touching pins and contacts.
Before You Begin 7