Table 18. LEDs description
Scenario AP0 LED AP1 LED
Fatal
Error
LED
XCC
heart-
beat
LED
note
Actions
RoT security module fatal
firmware failure
Off Off On N/A
Replace the firmware and RoT
security module.
Blink N/A On N/A
Blink N/A On N/A
No system power Off Off Off Off If the AC power is on, but the
system board assembly does not
have power, then:
1. Check the power supply unit
(PSU) or power distribution
board (PDB). If the PSU or
PDB has any error, replace it.
2. If there is no problem with
the PSU or PDB, replace the
system board.
XCC firmware recoverable error Blink N/A Off N/A
Information only. No action is
required.
XCC firmware is recovered from
error
On N/A Off N/A
UEFI firmware authentication
failure
N/A Blink Off N/A
UEFI firmware is recovered from
authentication failure
N/A On Off N/A
System is OK On On Off On
Note: For locations of the XCC heartbeat LED, see
āSystem-board LEDsā on page 35.
System-board LEDs
The following illustrations show the light-emitting diodes (LEDs) on the system board.
Press the power button to light the LEDs on the system board when the power source has been removed
from the server.
Chapter 2. Hardware components 35
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