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2–4 Maintenance and Service Guide
External component identification
Lights
Item Component Description
(1) Caps lock light On: Caps lock is on.
(2) Power lights (2)* ■ On: The computer is on.
■ Blinking: The computer is in the Sleep state.
■ Off: The computer is off or in Hibernation.
(3) Volume mute light ■ White: Computer sound is on.
■ Amber: Computer sound is off.
(4) Volume down light On: The volume scroll zone is being used to decrease speaker volume.
(5) Volume up light On: The volume scroll zone is being used to increase speaker volume.
(6) Num lock light On: Num lock is on or the embedded numeric keypad is enabled.
(7) Wireless light ■ On: An integrated wireless device, such as a wireless local area network
(WLAN) device and/or a Bluetooth® device, is on.
■ Off: All wireless devices are off.
(8) Battery light ■ On: A battery is charging.
■ Blinking: A battery that is the only available power source has reached a
low battery level. When the battery reaches a critical low-battery level, the
battery light begins blinking more rapidly.
■ 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.
(9) Drive light Blinking: The hard drive or optical drive is being accessed.
*The two 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.