HP ProBook 640 Maintenance and Service Guide - Page 21

Lights, Component, Description

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Lights Component (1) Power light (2) Microphone mute light (3) Num lock light (4) Wireless light (5) Mute light (6) Caps lock light Description ● On: The computer is on. ● Blinking: The computer is in the Sleep state, a power-saving state. The computer shuts off power to the display and other unneeded components. ● Off: The computer is off or in Hibernation. Hibernation is a power-saving state that uses the least amount of power. ● Amber: microphone sound is off. ● Off: microphone sound is on. On: Num lock is on. On: An integrated wireless device, such as a wireless local area network (WLAN) device and/or a Bluetooth device, is on. NOTE: On some models, the wireless light is amber when all wireless devices are off. ● Amber: Computer sound is off. ● Off: Computer sound is on. On: Caps lock is on, which switches the key input to all capital letters. Top 11

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Lights
Component
Description
(1)
Power light
●
On: The computer is on.
●
Blinking: The computer is in the Sleep state, a power-saving
state. The computer shuts
off
power to the display and
other unneeded components.
●
Off:
The computer is
off
or in Hibernation. Hibernation is a
power-saving state that uses the least amount of power.
(2)
Microphone mute light
●
Amber: microphone sound is
off.
●
Off:
microphone sound is on.
(3)
Num lock light
On: Num lock is on.
(4)
Wireless light
On: An integrated wireless device, such as a wireless local area
network (WLAN) device and/or a Bluetooth device, is on.
NOTE:
On some models, the wireless light is amber when all
wireless devices are
off.
(5)
Mute light
●
Amber: Computer sound is
off.
●
Off:
Computer sound is on.
(6)
Caps lock light
On: Caps lock is on, which switches the key input to all capital
letters.
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