Bottom - HP ProBook 450 G2 Maintenance And Service Manual

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NOTE: Refer to the illustration that most closely matches your computer.
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14 Chapter 2 External component identification
num lk key
Integrated numeric keypad
Vents (2)
Service door
Battery release latch
Description
Alternates between the navigational and numeric functions on
the integrated numeric keypad.
When num lk has been enabled, it can be used like an external
numeric keypad.
Description
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.
Provides access to the hard drive bay and the memory
module slots.
Releases the battery.