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Item Component Description
(1)
Power lights (2)*
●
On: The computer is on.
●
Blinking: The computer is in the Sleep state.
●
Off: The computer is off or in Hibernation.
(2)
Battery light
●
On: A battery is charging.
●
Blinking: A battery that is the only available power
source has reached a low battery level or a critical
battery level.
●
Off: If the computer is plugged into an external power
source, the light is turned off when all batteries in the
computer are fully charged. If the computer is not
plugged into an external power source, the light stays
off until the battery reaches a low battery level.
(3)
Drive light Blinking: The hard drive or optical drive is being accessed.
(4)
Caps lock light On: Caps lock is on.
(5)
Media button light Blinks once when the media button is pressed.
(6)
Volume mute light
●
Blue: Computer sound is turned on.
●
Amber: Computer sound is turned off.
(7)
Volume down light Blinking: The volume scroll zone is being used to decrease
speaker volume.
(8)
Volume up light Blinking: The volume scroll zone is being used to increase
speaker volume.
(9)
Num lock light On: Num lock is on or the embedded numeric keypad is
enabled.
*The 2 power lights display the same information. The light on the power button is visible only when the computer is open. The
power light on the front of the computer is visible whether the computer is open or closed.
10 Chapter 2 External component identification