HP ProBook 6455b, 6555b, 6450b and 6550b Notebook PCs Maintenance and Service Guide

Left-side components
NOTE: Refer to the illustration that most closely matches your computer.
Item Component Description
(1) 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.
(2) DisplayPort Connects an optional digital display device such as a
high-performance monitor or projector.
(3) USB ports (3) Connect optional USB devices.
(4) ExpressCard slot Supports optional ExpressCards.
(5) Audio-in (microphone) jack Connects an optional computer headset microphone,
stereo array microphone, or monaural microphone.
(6) 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.
Item Component Description
(1) 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.
Left-side components 27