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