2–2 Maintenance and Service Guide
External component identification
Lights
Item Component Description
1Caps lock light On—Caps lock is on.
2Power lights (2)* On—The computer is on.
Flashing—The computer is in the Sleep.
Off—The computer is off or in Hibernation.
3Wireless light Blue—An integrated wireless device, such as a wireless local area network
(WLAN) device and/or a Bluetooth® device, is on.
Amber—No wireless devices are detected.
4Num lock light On—The num lock is on or the embedded numeric keypad is enabled.
5Battery light On—The battery is charging.
Flashing—The battery reaches a low battery level or a critical battery level.
Off—If the computer is connected to an external power source, the light is off
when all batteries in the computer are fully charged. If the computer is not
connected to an external power source, the light is off until the battery
reaches a low battery level.
6Drive light Flashing—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.