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2–2 Maintenance and Service Guide
External component identification
Lights
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. When the battery reaches a critical
battery level, the battery light begins blinking 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.
3
Drive light Blinking: The hard drive or optical drive is being accessed.
4
TouchPad light White: TouchPad is enabled.
5
Caps lock light On: Caps lock is on.
6
Wireless light ■ Blue: An integrated wireless device, such as a wireless local
area network (WLAN) device and/or a Bluetooth® device, is
turned on.
■ Amber: All wireless devices are turned off.
7
Num lock light On: Num lock is on or the integrated 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.