2–2 Maintenance and Service Guide
External component identification
Lights
✎
Your computer may look slightly different from the illustration in this section.
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 Wireless light ■ Blue: An integrated wireless device, such as a wireless local area
network (WLAN) device and/or a Bluetooth® device, is on.
■ Amber: All wireless devices are off.
4 Num lock light On: Keypad numeric function is enabled.
5 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.
6 Drive light Blinking: The hard drive or optical drive is being accessed.
*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.
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