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:
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."
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:
Perform an orderly computer shutdown using the operating system
menu.
Turn off the computer and all attached devices.
Disconnect the computer and devices from their AC power sources.
Also, disconnect any telephone or telecommunication lines from the
computer. Doing so reduces the potential for personal injury or shock.
If you are disconnecting a device from the computer or are removing a component from the system board, wait 15 to 30 seconds after disconnecting the computer from AC power before disconnecting the device or removing the component to avoid possible damage to the system board.
Verify that the auxiliary power light on the system board is not on. If it is on, you may need to wait 15 to 30 seconds for it to go out (see "System Board Components" for the location of this light).
Wear a wrist grounding strap, and clip it to an unpainted metal
surface, such as the padlock ring on the back of the computer. If a wrist
grounding strap is not available, touch an unpainted metal surface on
the computer, such as the power supply, to discharge static charge from
your body before touching anything inside the computer. While you
work, periodically touch an unpainted metal surface on the computer
to dissipate static electricity that might harm internal components.
In addition, take note of the following safety guideline when appropriate:
Handle components and cards with care. Do not touch the components or contacts on a card. Hold a card by it edges or by its metal mounting bracket. Hold a component such as a microprocessor by its edges, not by its pins.
