Dell Dimension 4500 - Manual (Page 10)

10 S a f e t y I n s t r u c t i o n s
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• To help avoid possible damage to the system board, wait 5 seconds
after turning off the computer before disconnecting or connecting a
non-USB device from the computer.
• To help prevent electric shock, plug the computer and device 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.
• To help protect your computer from sudden, transient increases and
decreases in electrical power, use a surge suppressor, line conditioner,
or uninterruptible power supply.
• Be sure that nothing rests on your computer’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, contact Dell (see page 95).
• 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.
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 this guide and elsewhere in Dell
documentation. Always follow installation and service
instructions closely.