Dell OptiPlex 740 Quick Reference Manual page 20

3 network adapter
connector
4 network activity
light
5 line-out
connector
6 line-in connector
7 USB 2.0
connectors (5)
8 video connector
20
Quick Reference Guide
To attach your computer to a network or broadband device,
connect one end of a network cable to either a network jack
or your network or broadband device. Connect the other
end of the network cable to the network adapter connector
on the back panel of your computer. A click indicates that
the network cable has been securely attached.
NOTE:
Do not plug a telephone cable into the network
connector.
On computers with a network connector card, use the
connector on the 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.
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.
Use the green line-out connector to attach headphones and
most speakers with integrated amplifiers.
On computers with a sound card, use the connector on the
card.
Use the 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.
Use the back USB connectors for devices that typically
remain connected, such as printers and keyboards.
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. Do not remove the cap.
Connect your monitor to the connector on the graphics card.
NOTE:
If you are using a graphics card that supports dual
monitors, use the y-cable that came with your computer.