56 Removing and Installing Parts
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8diagnostic lights (4) Use the lights to help you troubleshoot a computer problem
based on the diagnostic code. For more information, see
"Diagnostic Lights" on page43.
9hard-drive activity light The hard drive activity light is on when the computer reads
data from or writes data to the hard drive. The light might also
be on when a device such as a CD player is operating.
10 power button,
power light
Press the power button to turn on the computer. The light in
the center of this button indicates power state. See
"Specifications" on page101 for more information.
NOTICE: To avoid losing data, do not use the power button to
turn off the computer. Instead, perform an operating system
shutdown.
11 USB 2.0 connectors (2) Use the front USB connectors for devices that you connect
occasionally, such as joysticks or cameras, or for bootable USB
devices (see "System Setup Options" on page107 for more
information on booting to a USB device). It is recommended
that you use the back USB connectors for devices that typically
remain connected, such as printers and keyboards.
12 vents For adequate cooling, do not block any of the vents.
NOTICE: Ensure that there is a minimum of two inches of space
between all vents and any object near these vents.
NOTICE: Keep the vent area clean and dust-free to ensure that
the computer is adequately ventilated. Use only a dry cloth to
clean the vent area to avoid water damage to the computer.