Asus Z8PE-D18 - Manual (Page 23)

ASUS Z8PE-D18 2-5
4. BMC LED (BMC_LED1)
The green heartbeat LED blinks per second to indicate that the ASMB4 is
working normally.
• 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.