10 Before You Begin
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Getting Started
This section provides procedures for removing and replacing the
components, assemblies, and subassemblies in the Dell™ OptiPlex™
GX240 small form-factor, small desktop, and small mini-tower computers.
Unless otherwise noted, each procedure assumes that the following
conditions exist:
•You have performed the steps in "Precautionary Measures."
•You have opened the computer cover.

Recommended Tools

The GX240 computer is primarily a tool-less one, but certain procedures
(such as removing the heat sink blower or the control panel) require the use
of one or more of the following tools:
•Small flat-blade screwdriver
•#1 and #2 Phillips-head screwdrivers
•An 8-inch, #2 Phillips-head screwdriver
Also, Dell recommends that you use a wrist grounding strap as explained in
"Precautionary Measures."
Precautionary Measures
Before you perform any procedure in this section, read the following caution
for your personal safety and to prevent damage to the computer from
electrostatic discharge (ESD).
CAUTION: FOR YOUR PERSONAL SAFETY AND PROTECTION OF
THE EQUIPMENT
Before you start to work on the computer, perform the following steps in the
sequence listed:
1Perform an orderly computer shutdown using the operating system
menu.
2Turn off the computer and all attached devices.