HP ProBook 4520s Notebook PC and HP ProBook 4720s Notebook PC - Maintenance and Service Guide

Left-side components
Component Description
(1) Security cable slot Attaches an optional security cable to the computer.
NOTE: The security cable is designed to act as a deterrent, but it
may not prevent the computer from being mishandled or stolen.
(2) 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.
(3) External monitor port Connects an external VGA monitor or projector.
(4) RJ-45 (network) jack Connects a network cable.
(5) HDMI port Connects an optional HDMI device.
(6) Combo eSATA/USB port Connects an optional USB device or high-performance eSATA
components such as an eSATA external hard drive.
(7) USB port Connects optional USB device.
(8) ExpressCard slot Supports optional ExpressCards.
16 Chapter 2 External component identification