Dell OptiPlex GX240 - Manual (Page 15)

Setup and Quick Reference Guide 13
• 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.
• 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.
Ergonomic Computing Habits
CAUTION: Improper or prolonged keyboard use may result in
injury.
CAUTION: Viewing the monitor screen for extended periods of
time may result in eye strain.
For comfort and efficiency, observe the ergonomic guidelines in your
User’s Guide when setting up and using your computer system.