Dell OptiPlex GX280 - Manual (Page 245)

On computers with a sound card, the microphone connector is on the card.
8 USB 2.0
connectors
(6)
Use the back USB connectors for devices that typically remain connected,
such as printers and keyboards.
9 video
connector
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. Connect your monitor to the connector on the graphics
card. Do not remove the cap.
NOTE: If you are using a graphics card that supports dual monitors, use the
y-cable that came with your computer.
10 serial
connector
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."
Inside Your Computer
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the
Product 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.
1 drives bay (CD/DVD, floppy, and hard drive) 5 PCI slots (3)
2 power supply
6 heat sink shroud assembly
3 chassis intrusion switch 7 front I/O panel
4 system board