Dell OptiPlex 330 User Manual page 22

1 Service Tag
2 optical drive
3 floppy drive
4 drive activity light
5 USB 2.0 connectors (2) Use the front USB connectors for devices that you connect
6 diagnostic lights
7 power button,
power light
8 headphone connector
9 microphone connector Use the microphone connector to attach a personal
10 LAN indicator light
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Use the Service Tag to identify your computer when you
access the Dell Support website or call Support.
Use the optical drive to play a CD/DVD.
The floppy drive is optional.
The 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 an optical drive
is operating.
occasionally, such as joysticks or cameras, or for bootable
USB devices (see "System Setup Options" on page 80
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.
Use these lights to help you troubleshoot a computer
problem based on the diagnostic code. For more
information, see "Diagnostic Lights" on page 106.
Press the power button to turn on the computer.
The light in the center of this button indicates
power state.
NOTICE:
To avoid losing data, do not use the
power button to turn off the computer. Instead,
perform an operating system shutdown.
Use the headphone connector to attach headphones
and most kinds of speakers.
computer microphone.
On computers with a sound card, the microphone
connector is on the card.
This light indicates that a LAN (local area network)
connection is established.