6 Power Management States
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Unplugged
The Advanced Configuration and Power Interface (ACPI) specification refers to the unplugged state as mechanical off.
In this state:-
The AC power cord is not connected to a wall outlet.
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The power button LED is off.
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The LCD is blank.
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NOPOWER
The ACPI specification refers to the NOPOWER state as S5, or a soft-off state in which the power supply remains active but delivers minimal power to key circuits to detect a power button or wake-on-LAN event.
In this state:-
The AC power cord is connected to a wall outlet.
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The operating system and applications are not running.
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The RAM contents are undefined.
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The power button LED is white and fades in and out.
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The LCD is off.
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ON
In this state:-
The operating system and POS application are in operation.
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The RAM contents are maintained.
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The power button LED is white.
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ON, in BIOS utility
In this state:-
The BIOS configuration utility is in operation.
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The power button LED is white and blinks off and on.
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