Dell OptiPlex GX240 - Manual (Page 9)

11
Safety First—For You and Your
Computer
The procedures in this section require that you open the cover and work
inside your computer.
NOTICE: Do not attempt to service the computer yourself, except as
explained in this guide and elsewhere in Dell documentation. Always follow
installation and service instructions closely.
NOTICE: Before disconnecting a device from the computer or removing a
component from the system board, verify that the standby power light on the
system board has turned off. For the location of this light, see the
system
board .
Working inside your computer is safe—if you observe the following
precautions.
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 indicated:
1 Turn off the computer and all devices.
2 Touch an unpainted metal surface on the computer chassis, such as the
metal around the card-slot openings at the back of your computer,
before touching anything inside your computer.
3 Disconnect the computer and devices from their electrical outlets.
Doing so reduces the potential for personal injury or shock. Also
disconnect any telephone or telecommunication lines from the
computer.
In addition, take note of these safety guidelines when appropriate:
• When you disconnect a cable, pull on its connector or on its strain-
relief loop, not on the cable itself. Some cables have a connector with
locking tabs; if you are disconnecting this type of cable, press in on the
locking tabs before disconnecting the cable. As you pull connectors
apart, keep them evenly aligned to avoid bending any connector pins.
Also, before you connect a cable, make sure both connectors are
correctly oriented and aligned.