HP EliteBook 8540w Mobile Workstation - Manual (Page 22)

Component Description
(6) Audio-in (microphone) jack Connects an optional computer headset microphone, stereo array
microphone, or monaural microphone.
(7) Audio-out (headphone) jack Produces sound when connected to optional powered stereo
speakers, headphones, ear buds, a headset, or television audio.
NOTE: When a device is connected to the headphone jack, the
computer speakers are disabled.
(8) ExpressCard slot Supports optional ExpressCards.
Rear components
The vent enables airflow to cool internal components.
NOTE: 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.
Component Description
(1) External monitor port Connects an external VGA monitor or projector.
(2) Power connector Connects an AC adapter.
10 Chapter 1 Features