Acer R720 Series manual Color, Status, Description, indicator

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Item	LED	Color	Status	Description
	indicator
C	Power/	Green, off	Power off	System is not powered on.
	Sleep
	indicator	Green, on	Power on	System has power applied to it.
		Green, off	S4/S5	System is in ACPI S4 or S5 state
				(power off).
		Green,	S1	System is in ACPI S1 state (sleep
		blinking		mode).
		Green, on	S0	System is in ACPI S0 state
				(legacy power on).
D	Status/	Green, on	Ready	System booted and ready.
	fault
	indicator	Green,	Degraded	•	CPU disabled
		blinking	condition	• System memory mapped out
					or disabled by BIOS.
				• Non-redundant power
					supply operation.
		Amber, on	Critical	•	Critical temperature,
			condition		voltage, or fan threshold
					crossing.
				•	Critical power supply
					failure.
				• System unable to power up
					due to incorrectly installed
					CPU or incompatible CPU.
				• One or more of the drive
					status fault LEDs are
					asserted on the hot-swap
					backplane board.
				•	System memory
					uncorrectable ECC error.
				•	Fatal uncorrectable bus
					errors.