Left-side components, Identifying hardware 9 – HP ProBook 4321s Notebook-PC User Manual
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Component
Description
(1)
USB ports (2)
Connect optional USB devices.
(2)
RJ-11 (modem) jack (select models only)
Connects a modem cable.
(3)
Optical drive (select models only)
Reads optical discs and, on select models, also writes to optical
discs.
(4)
Optical drive light (select models only)
Blinking: The optical drive is being accessed.
(5)
AC adapter light
●
On: The computer is connected to external power and the
battery is charging.
●
Off: The computer is not connected to external power.
(6)
Power connector
Connects an AC adapter.
Left-side components
NOTE:
Refer to the illustration that most closely matches your computer.
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)
Power connector
Connects an AC adapter.
(3)
AC adapter light
●
On: The computer is connected to external power and the
battery is charging.
●
Off: The computer is not connected to external power.
(4)
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.
Identifying hardware
9