External monitor port
Powered USB port
Audio-in (microphone) jack
Audio-out (headphone) jack
Chapter 2 External component identification
Connects an external VGA monitor or projector.
Enables airflow to cool internal components.
The computer fan starts up automatically to cool internal
components and prevent overheating. It is normal for the internal
fan to cycle on and off during routine operation.
Provides power to a USB device, such as an optional external
MultiBay or an optional external optical drive, if used with a
powered USB cable.
Connects an optional computer headset microphone, stereo array
microphone, or monaural microphone.
Produces sound when connected to optional powered stereo
speakers, headphones, ear buds, a headset, or television audio.
To reduce the risk of personal injury, adjust the
volume before putting on headphones, earbuds, or a headset. For
additional safety information, refer to the Regulatory, Safety and
When a device is connected to the headphone jack, the
computer speakers are disabled.