Power supply LED
This topic provides information about various power supply LED status and corresponding action
suggestions.
• The following minimal configuration is required for the node to start:
– One processor in socket 1
– One memory module in DIMM slot 4
– One power supply in PSU slot 1
– One boot drive, M.2 or E3.S drive, and RAID adapter if configured (If OS is needed by debugging)
– Four system fans
The following table describes the problems that are indicated by various combinations of the power-supply
LED and the power-on LED and suggested actions to correct the detected problems.
Figure 146. Power supply LED
LED
Description
1 Power supply
status
The power supply status LED can be in one of the following states:
• Green: The power supply is connected to the AC power source and working normally.
• Off: The power supply is disconnected from the AC power source.
• Slow blinking green (about one flash every second): The power supply is in PSU standby
state with AC present, cold standby state, or always standby state.
• Amber: The AC power cord is unplugged, AC power lost (with a second power supply in
parallel still in AC power input power), or power supply has failed. To resolve the issue, replace
the power supply.
• Slow blinking amber (about one flash every second): Power supply warning events where
the power supply continues to operate.
Firmware and RoT security module LEDs
The following illustration shows the light-emitting diodes (LEDs) on the Firmware and RoT security module
(ThinkSystem V3 Firmware and Root of Trust Security Module).
Chapter 8. Problem determination 207
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