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Dell OptiPlex 755 - Before You Begin; Recommended Tools; Turning Off Your Computer; Before Working Inside Your Computer

Dell OptiPlex 755
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Quick Reference Guide 21
2 link integrity light
Green — A good connection exists between a 10-Mbps
network and the computer.
Orange — A good connection exists between a 100-Mbps
network and the computer.
Yellow — A good connection exists between a 1-Gbps
(or 1000-Mbps) network and the computer.
Off — The computer is not detecting a physical
connection to the network.
3 network adapter
connector
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.
Remote management features require use of the onboard
NIC.
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-out
connector
Use the green line-out connector to attach headphones and
most speakers with integrated amplifiers.
6 line-
in/microphone
connector
Use the blue and pink line-in/microphone connector to
attach a record/playback device such as a cassette player, CD
player, or VCR.; or a personal computer microphone for
voice or musical input into a sound or telephony program.
7 USB 2.0
connectors (6)
Use the back USB connectors for devices that typically
remain connected, such as printers and keyboards.

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