For more information, see Diagnostic Lights. If you must use Category 3 wiring, force the network speed to 10 Mbps to ensure reliable operation. Plug USB, audio, and other devices into the appropriate connector. It is recommended that you use Category 5 wiring and connectors for your network. Flashes a yellow light when the computer is transmitting or receiving network data. The light might also be on when a device such as a CD player is operating. See Removing the Computer Cover.
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Use this latch to remove the cover. For adequate cooling, do not block any of the vents. On computers with a sound card, the microphone connector is on the card. Keep the vent area clean and dust-free to ensure that the computer is adequately ventilated.
See Back Panel Connectors for more information. Use the black surround del to attach multichannel-capable speakers. This light indicates that a LAN local area network connection is established. Connect the other end of the network cable to the network adapter connector on the back panel of your computer. Do not plug a telephone cable into the network connector.
Dell Dimension E521 Parts
Can contain an optional floppy drive or optional Media Card Reader. On computers with a sound card, use the connector on the card. Use the green line-out connector available on computers with integrated sound to attach headphones and most speakers with integrated amplifiers.
Use only a dry cloth to clean the vent area to avoid water damage to the computer. To attach your computer to a network or broadband device, connect one end of a network cable to either a network port or your network or broadband device. Use the Service Tag to identify your computer when you access the Dell Support website or call technical support. If you must use Category 3 wiring, force the network speed to 10 Mbps to ensure reliable operation. See Removing the Computer Cover.
Back View of the Computer. For more information, see Diagnostic Lights. Use the silver connector to provide enhanced surround audio for computers with 7. Instead, perform an operating system shutdown.
The light in the center of this button indicates power state. It is recommended that you use Category 5 wiring and connectors for your network. A high volume of network traffic may make this light appear to be in a steady “on” state.
soud On computers with a network connector card, use the connector on the card. It is recommended that you use the back USB connectors for devices that typically remain connected, such as printers and keyboards.
Front View of the Computer. Ensure that there is a minimum of two inches of space between all vents and any object near these vents. The light might also be on when a device such as a CD player eell operating. Press the power button to turn on the computer.
Dell X-Fi Sound Card for Dimension E, E and Overview – CNET
Use the headphone connector to attach headphones and most kinds of speakers. Plug USB, audio, and other devices into the appropriate connector.
The hard-drive activity light is on when the computer reads data from or writes data to the hard drive. To avoid losing data, do not use the power button to turn off the computer. Use the back USB soumd for devices that typically remain connected, such as printers and keyboards.