32 About Your Computer—Dell Precision 450
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Inside Your Computer
CAUTION: Before you begin any of the procedures in this section, follow the
safety instructions in the
System Information Guide
.
CAUTION: To avoid electrical shock, always unplug your computer from the
electrical outlet before opening the cover.
NOTICE: Be careful when opening the computer cover to ensure that you do not accidentally
disconnect cables from the system board.
7 network activity light The yellow light flashes 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.
8 USB 2.0connectors (2) 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.
9 USB 2.0 connectors (2) 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.
10 keyboard connector If you have a standard keyboard, plug it into the purple keyboard connector. If you
have a USB keyboard, plug it into a USB connector.
11 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, use the microphone connector on the card.
12 serial connector (COM
2)
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."
13 serial connector (COM
1)
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."
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