Before You Begin; Recommended Tools; Turning Off Your Computer; Before Working Inside Your Computer - Dell Precision 490 Desktop User Manual

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Before You Begin
Dell Precision™ Workstation 490 User's Guide
Recommended Tools
Turning Off Your Computer
Before Working Inside Your Computer
This chapter provides procedures for removing and installing the components in your computer. Unless otherwise noted, each procedure assumes that the
following conditions exist:
You have performed the steps in
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You have read the safety information in the Dell™ Product Information Guide.
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Recommended Tools
The procedures in this document may require the following tools:
Small flat-blade screwdriver
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Phillips screwdriver
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Flash BIOS update program CD
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Turning Off Your Computer
NOTICE: To avoid losing data, save and close all open files and exit all open programs before you turn off your computer.
1. Shut down the operating system:
a. Save and close all open files, exit all open programs, click the Start button, and then click Turn Off Computer.
b. In the Turn off computer window, click Turn off.
The computer turns off after the operating system shutdown process is complete.
2. Ensure 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, turn them off now.
Before Working Inside Your Computer
Use the following safety guidelines to help protect your computer from potential damage and to help ensure your own personal safety.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
NOTICE: Handle components and cards with care. Do not touch the components or contacts on a card. Hold a card by its edges or by its metal
mounting bracket. Hold a component such as a processor by its edges, not by its pins.
NOTICE: 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.
NOTICE: When you disconnect a cable, pull on its connector or on its strain-relief loop, not on the cable itself. Some cables have connectors with locking
tabs; if you are disconnecting this type of cable, press in on the locking tabs before you disconnect the cable. As you pull connectors apart, keep them
evenly aligned to avoid bending any connector pins. Also, before you connect a cable, ensure that both connectors are correctly oriented and aligned.
NOTICE: To avoid damaging the computer, perform the following steps before you begin working inside the computer.
1. Turn off your computer (see
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug the cable from the network device.
2. Disconnect all telephone or network cables from the computer.
3. Disconnect your computer and all attached devices from their electrical outlets.
4. Press the power button to ground the system board.

Turning Off Your Computer

and
Turning Off Your Computer).
Before Working Inside Your Computer.