Back View Of Your Computer; Connecting Devices; Serial Port Connectors; Parallel Port Connector - Dell OptiPlex GX400 User Manual

Power indicator — contains a light that illuminates in two colors and blinks or remains solid to indicate different states.
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Diskette-drive access indicator — lights when the drive is reading data from, or writing data to, a diskette. Wait until this indicator turns off before you
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remove a diskette from the drive.
Hard-drive access indicator — lights when a hard drive or CD drive is reading data from, or writing data to, the drive.
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Cover release button — releases the computer cover; located on back of chassis.
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Back View of Your Computer

The following illustration shows the connectors and indicators on the back of your computer for attaching external devices.
Back-Panel Connectors and Indicators

Connecting Devices

When you connect external devices to your computer's back panel, follow these guidelines:
Check the documentation that accompanied the device for specific installation and configuration instructions.
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For example, you must connect most devices to a particular input/output (I/O) port or connector to operate properly. Also, external devices like a printer
usually require you to load device drivers before they will work.
When connecting a Universal Serial Bus (USB) mouse or keyboard, make sure you connect to one of the Port 1 USB connectors.
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Always attach external devices while your computer is turned off. Then turn on the computer before turning on any external devices, unless the
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documentation for the device specifies otherwise.
NOTICE: When you disconnect external devices from the back of the computer, wait 5 seconds after turning off the computer before you reconnect any
devices to avoid possible damage to the system board.

Serial Port Connectors

Default port designations: COM1 for serial port 1 and COM2 for serial port 2. You can reassign the serial port's designation in
expansion card containing a serial port using this designation.
If you set the system's serial ports to Auto in
computer automatically maps (assigns) the integrated ports to the appropriate COM setting as necessary.
Before you add a card with a serial port, check the documentation that accompanied your software to make sure that the software can be mapped to the new
COM port designation.

Parallel Port Connector

Used to connect printers. Default designation: LPT1.
NOTE: The integrated parallel port is automatically disabled if the system detects an installed expansion card containing a parallel port configured to
the same address as specified in the Parallel Port option in

Microphone Jack

Used to attach a standard personal computer microphone. Connect the audio cable from the microphone to the microphone jack.
Line-Out/Speaker Jack
Used to attach computer speakers. This jack is amplified, so speakers with integrated amplifiers are not required. Connect the audio cable from the speakers
to this jack.
Line-In Jack
system setup and add an expansion card containing a serial port configured to a specific designation, the
system setup.
system setup if you add an