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Chapter 4: Motherboard Connections
4.5 LED Indicators
BMC Heartbeat LED
LEDM1 is the BMC Heartbeat LED. When the LED is blinking green, BMC is working. Refer
to the table below for the LED status.
BMC Heartbeat LED
LED Color
Definition
Green: Blinking
BMC Normal
Onboard Power LED
LED4 is the onboard Power LED. When this LED is on, the system is on. Turn off the system
and unplug the power cord before removing or installing components. Refer to the table below
for more information.
Onboard Power LED Indicator
LED Color
Definition
Off
System Off (power cable not connected)
Green
System On
M.2 LED
An M.2 LED is located at LED3 on the motherboard. When LED3 is blinking green, M.2
functions normally. Refer to the table below for more information.
M.2 LED State
LED Color
Definition
Green: Blinking
Device Working
UID LED
LED Indicator
LED Color
Definition
Blue: On
Unit Identified
Unit ID LED
A rear UID LED indicator (LED1) is located next to the UID switch on the motherboard. This
UID indicator provides easy identification of a system unit that may need service.
