Table 51. System-board-assembly LEDs (continued)
LED
Description
Action
3 XCC heartbeat
LED (green)
The XCC heartbeat LED helps
you identify the XCC status.
• Blinking (about one flash per
second) : XCC is working
normally.
• Blinking at other speeds or
always on: XCC is at the initial
phase or is working
abnormally.
• Off: XCC is not working.
• If the XCC heartbeat LED is always off or always on, do
the following:
– If XCC cannot be accessed:
1. Re-plug the power cord.
2. Check and ensure that the system I/O board
and the firmware and RoT security module are
installed correctly. (Trained technician only)
Reinstall them if needed.
3. (Trained technicians only) Replace the firmware
and RoT security module.
4. (Trained technicians only) Replace the system I/
O board.
– If XCC can be accessed, replace the system I/O
board.
• If the XCC heartbeat LED is blinking fast over 5
minutes, do the following:
1. Re-plug the power cord.
2. Check and ensure that the system I/O board and
the firmware and RoT security module are installed
correctly. (Trained technician only) Reinstall them
if needed.
3. (Trained technicians only) Replace the firmware
and RoT security module.
4. (Trained technicians only) Replace the system I/O
board.
• If the XCC heartbeat LED is blinking slowly over 5
minutes, do the following:
1. Re-plug the power cord.
2. Check and ensure that the system I/O board and
the firmware and RoT security module are installed
correctly. (Trained technician only) Reinstall them
if needed.
3. If the problem remains, contact Lenovo Support.
4 System status
LED (green)
The system status LED indicates
the working status of the system.
• Fast blinking (about four
flashes per second): Power
fault or is waiting for XCC
power permission ready.
• Slow blinking (about one flash
per second): Power off and is
ready to be powered on
(standby state).
• ON: Power on
Video of LED blinking status is
available at:
YouTube
• If the system status LED is blinking fast over 5 minutes
and cannot power on, check the XCC heartbeat LED
and follow the
actions for the XCC heartbeat LED.
• If the system status LED remains off or is blinking fast
(about four flashes per second) and the system error
LED on the front panel is on (yellow), the system is in a
power fault status. Do the following:
1. Re-plug the power cord.
2. Remove installed adapters/devices, one at a time,
until you reach the minimal configuration for
debugging.
3. (Trained technicians only) If the problem remains,
capture FFDC log, and replace the processor
board.
Chapter 8. Problem determination 299
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