Asus RS300-E8-PS4, User Manual

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Chapter 4: Motherboard information 4-20
2. Baseboard Management Controller LED (BMC_LED1)
The green heartbeat LED blinks per second to indicate that the ASMB7 is
working normally. The BMC LED works with the ASUS ASMB7 management
device and indicates its initiation status. When the PSU is plugged and the
system is OFF, ASUS ASMB7 management device starts system initiation for
about one (1) minute. The BMC LED blinks after system initiation finishes.
4.4 Internal LEDs
1. Standby Power LED (SB_PWR1)
The motherboard comes with a standby power LED. The green LED lights up
to indicate that the system is ON, in sleep mode, or in soft-off mode. This is a
reminder that you should shut down the system and unplug the power cable
before removing or plugging in any motherboard component. The illustration
below shows the location of the onboard LED.