When Working Inside Your Computer - Dell OptiPlex GX260 Series System User's Manual

Do not push any objects into the openings of your computer. Doing so can cause fire or electric shock by shorting out
interior components.
Keep your computer away from radiators and heat sources. Also, do not block cooling vents. Avoid placing loose
papers underneath your computer; do not place your computer in a closed-in wall unit or on a bed, sofa, or rug.
Do not spill food or liquids on your computer.
Do not use your computer during an electrical storm unless the AC adapter cable has been disconnected from the
electrical outlet.
When you use the AC adapter to run the computer or to charge the battery, place the AC adapter in a ventilated area,
such as a desk top or on the floor.
The AC adapter may become hot during normal operation of your computer. Use care when handling the adapter
during or immediately after operation.
As you use your computer, observe the following safe-handling guidelines.
CAUTION: Do not operate your computer with any cover(s) (including computer covers, bezels, filler
brackets, front-panel inserts, and so on) removed.
Your computer is equipped with one of the following:
A fixed-voltage power supply — Computers with a fixed-voltage power supply do not have a voltage selection
switch on the back panel and operate at only one voltage (see the regulatory label on the outside of the
computer for its operating voltage).
An auto-sensing voltage circuit — Computers with an auto-sensing voltage circuit do not have a voltage
selection switch on the back panel and automatically detect the correct operating voltage.
A manual voltage selection switch — Computers with a voltage selection switch on the back panel must be
manually set to operate at the correct operating voltage.
et the switch to the position that most closely matches the voltage used in your location."
NOTICE:
To help avoid damaging a computer with a manual voltage selection switch, set the switch for the voltage
that most closely matches the AC power available in your location. For Japan, the voltage selection switch must be set
to the 115-V position even though the AC power available in Japan is 100 V. Also, ensure that your monitor and
attached devices are electrically rated to operate with the AC power available in your location.
Before working inside the computer, unplug the computer to help prevent electric shock or system board damage.
Certain system board components continue to receive power any time the computer is connected to AC power.

When Working Inside Your Computer

Before you open the computer cover, perform the following steps in the sequence indicated.
CAUTION: Do not attempt to service the computer yourself, except as explained in your online Dell™
documentation or in instructions otherwise provided to you by Dell. Always follow installation and service
instructions closely.
NOTICE: To help avoid possible damage to the system board, wait 5 seconds after turning off the computer before