Dell OptiPlex GX520 - Manual (Page 160)

Inside Your Computer
card.
It is recommended that you use Category 5 wiring and connectors for
your network. If you must use Category 3 wiring, force the network
speed to 10 Mbps to ensure reliable operation.
4 network
activity light Flashes a yellow light when the computer is transmitting or receiving
network data. A high volume of network traffic may make this light
appear to be in a steady "on" state.
5 line-in
connector Use the blue line-in connector (available on computers with integrated
sound) to attach a record/playback device such as a cassette player, CD
player, or VCR.
On computers with a sound card, use the connector on the card.
6 line-out
connector Use the green line-out connector (available on computers with
integrated sound) to attach headphones and most speakers with
integrated amplifiers.
On computers with a sound card, use the connector on the card.
7 microphone
connector Use the pink microphone connector (available on computers with
integrated sound) to attach a personal computer microphone for voice or
musical input into a sound or telephony program.
On computers with a sound card, the microphone connector is on the
card.
8 USB 2.0
connectors
(6) Use the back USB connectors for devices that typically remain connected,
such as printers and keyboards.
9 video
connector Plug the cable from your VGA-compatible monitor into the blue connector.
NOTE: If you purchased an optional graphics card, this connector will be
covered by a cap. Connect your monitor to the connector on the graphics
card. Do not remove the cap.
NOTE: If you are using a graphics card that supports dual monitors, use
the y-cable that came with your computer.
10 serial
connector
Connect a serial device, such as a handheld device, to the serial port.
The default designations are COM1 for serial connector 1 and COM2 for
serial connector 2.
For more information, see " System Setup Options ."
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
CAUTION: To avoid electrical shock, always unplug your computer from the electrical outlet before removing the computer cover.
NOTICE: Be careful when opening the computer cover to ensure that you do not accidentally disconnect cables from the system board.
1 drive release latch 5 system board
2 CD/DVD drive 6 heat sink and blower assembly