Asus KGMH-D16 QDR User Manual page 22

2. CPU warning LED (ERR_CPU1, ERR_CPU2)
The CPU warning LEDs light up to indicate that an impending failure of the
corresponding CPU.
3. BMC LED (BMC_LED1)
The green heartbeat LED blinks per second to indicate that the ASMB4 is
working normally.
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2-4
The heartbeat LED functions only when you install the ASUS ASMB4.
Everytime after the AC power is replugged, you have to wait for about 30
seconds for the system power up
Chapter 2: Hardware information