Dell OptiPlex DHS Guide De Configuration Et De Référence Rapide page 27

NOTE: Auto-select power supplies do not require a voltage selection
switch. Your power supply may not have this switch.
• To help prevent electric shock, plug the computer and peripheral
power cables into properly grounded power sources. These cables are
equipped with three-prong plugs to help ensure proper grounding. Do
not use adapter plugs or remove the grounding prong from a cable. If
you must use an extension cable, use a three-wire cable with properly
grounded plugs.
• Before working inside the computer, unplug the system 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.
• To help avoid possible damage to the system board, wait 15 seconds
after unplugging the system before disconnecting a device from the
computer.
NOTICE: Observe when the auxiliary power light-emitting diode (LED)
indicator on the system board turns off to verify that system power is off (see
your User's Guide for the location of this LED).
• To help protect your computer system from sudden, transient
increases and decreases in electrical power, use a surge suppressor, line
conditioner, or uninterruptible power supply (UPS).
• Be sure nothing rests on your computer system's cables and that the
cables are not located where they can be stepped on or tripped over.
• Do not spill food or liquids on your computer. If the computer gets
wet, consult your User's Guide.
S e tu p a n d Q u i c k Re fe re n c e Gui d e
25