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2–6 Maintenance and Service Guide
External component identification
Front components
Item Component Description
(1) Power light ■ 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 or a critical battery level.
■ 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) Consumer infrared lens Receives a signal from the remote control (provided with select models only).
(5) Audio-in (microphone) jack Connects an optional computer headset microphone, stereo array
microphone, or monaural microphone.
(6) Audio-out (headphone) jack Produces sound when connected to optional powered stereo speakers,
headphones, ear buds, a headset, or television audio.