HP EliteBook 8770w Mobile Workstation - Manual (Page 23)

Rear
Component Description
(1) RJ-11 (modem) jack Connects a modem cable.
(2) Vents (2) Enable 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) Power connector Connects an AC adapter.
Rear 11