2Ensure that the computer and all attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut down your operating system, press and hold the power button for about 4 seconds to turn them off.
Safety Instructions
Use the following safety guidelines to help protect your computer from potential damage and to help to ensure your own 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 www.dell.com/regulatory_compliance.
CAUTION: Only a certified service technician should perform repairs on your computer. Damage due to servicing that is not authorized by Dell is not covered by your warranty.
CAUTION: When you disconnect a cable, pull on its connector or on its
CAUTION: To avoid damaging the computer, perform the following steps before you begin working inside the computer.
1Ensure that the work surface is flat and clean to prevent the computer cover from being scratched.
2Turn off your computer (see "Turning Off Your Computer" on page 11).
CAUTION: To disconnect a network cable, first unplug the cable from your computer and then unplug the cable from the network device.
3Disconnect all telephone or network cables from the computer.
4Disconnect your computer and all attached devices from their electrical outlets.
5Press and hold the power button while the system is unplugged to ground the system board.
12
Before You Begin
