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
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