Dell Dimension 4500S - Manual (Page 54)

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7 line-out connector Use the green line-out connector (available on computers with integrated sound) to attach headphones and
most speakers with integrated amplifiers.
On computers with a sound card, the line-out connector is on the card.
8 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, the microphone connector is on the card.
9 USB connectors (4) Connect USB devices such as a mouse, keyboard, printer, joystick, and computer speakers into any of the USB
connectors.
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 diagnostic lights (4) Use the lights to help you recognize a diagnostic code that can tell you how to troubleshoot a computer problem.
12 video connector Plug the cable from your monitor into the blue connector.
13 serial connector Connect a serial device, such as a handheld device, to the serial port.