HP ProBook 640 G1 Maintenance And Service Manual page 26

Component
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16 Chapter 2 External component identification
Power light
Microphone mute light
Num lock light
Wireless light
Mute light
Caps lock light
TouchPad light
Description
●
On: The computer is on.
●
Blinking: The computer is in the Sleep state.
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Off: The computer is off.
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Amber: Microphone sound is off.
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Off: Microphone sound is on.
On: Num lock is on.
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White: An integrated wireless device, such as a wireless
local area network (WLAN) device and/or a Bluetooth®
device, is on.
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Amber: All wireless devices are off.
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Amber: Computer sound is off.
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White: Computer sound is on.
On: Caps lock is on.
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Amber: The TouchPad is off.
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Off: The TouchPad is on.