Dell Dimension E521 - Manual (Page 4)

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network speed to 10 Mbps to ensure reliable operation.
3 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.
4 surround
connector Use the black surround connector to attach multichannel-capable
speakers.
5 line-in connector Use the blue line-in connector 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 Use the pink connector 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 side surround
connector Use the silver connector to provide enhanced surround audio for
computers with 7.1 speakers.
On computers with a sound card, the microphone connector is on
the card.
9 center/subwoofer
connector Use the yellow connector to attach a speaker to a Low Frequency
Effects (LFE) audio channel.
10 USB 2.0 connectors
(4)
Use the back USB connectors for devices that typically remain
connected, such as printers and keyboards.
It is recommended that you use the front USB connectors for
devices that you connect occasionally, such as joysticks or cameras.
11 VGA video
connector
Connect the monitor's VGA cable to the VGA connector on the
computer.
On computers with a video card, use the connector on the card.