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Chapter 4: Motherboard Connections
4.5 LED Indicators
BMC Heartbeat LED
A BMC Heartbeat LED is located at LEDM1 on the motherboard. When LEDM1 is blinking,
the BMC is functioning normally. Refer to the table below for more information.
BMC Heartbeat LED Indicator
LED Color
Definition
Green:
Blinking
BMC Normal
Onboard Power LED
The onboard Power LED is located at LED2 on the motherboard. When this LED is on, the
system power is on. Be sure to turn off the system power 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 Power
Off (power cable
not connected)
Green
System Power
On
UID LED
LED Color
Definition
Blue: On
Unit Identified
Unit ID LED
A unit identifier LED indicator is located at LED1 on the motherboard. This UID indicator
provides easy identification of a system unit that may need service.