Skip to main content

Rear view LEDs

The rear of the server provides system ID LED, system error LED, network LEDs, and power supply LEDs.

The following illustration shows the LEDs on the rear view of server models with three PCIe slots. The LEDs on the rear view of server models with two PCIe slots are the same.

Figure 1. Rear view LEDs
Graphic that depicts the rear view of the server. It includes callouts to identify each of the components.

Table 1. LEDs on the rear view of the server
CalloutCallout
1 System ID LED2 System error LED
3 Ethernet link LED4 Ethernet activity LED
5 Power input LED6 Power output LED
7 Power supply error LED 

1 System ID LED

The blue system ID LED helps you to visually locate the server. A system ID LED is also located on the front of the server. Each time you press the system ID button, the state of both the system ID LEDs changes. The LEDs can be changed to on, blinking, or off. You can also use the Lenovo XClarity Controller or a remote management program to change the state of the system ID LEDs to assist in visually locating the server among other servers.

2 System error LED

The system error LED helps you to determine if there are any system errors. For details, see System error LED.

3 Ethernet link LED

4 Ethernet activity LED

Each Ethernet connector has two status LEDs.
Ethernet status LEDColorStatusDescription
3 Ethernet link LEDGreenOnNetwork link is established.
NoneOffNetwork link is disconnected.
4 Ethernet activity LEDGreenBlinkingNetwork link is connected and active.
NoneOffThe server is disconnected from a LAN.

5 6 7 Power supply LEDs

Each hot-swap power supply has three status LEDs.
LEDDescription
5 Power input LED

  • Green: The power supply is connected to the ac power source.

  • Off: The power supply is disconnected from the ac power source.

6 Power output LED

  • Green: The server is on and the power supply is working normally.

  • Blinking green: The power supply is in the zero-output mode (standby). When the server power load is low, one of the installed power supplies enters into the standby state while the other one delivers the entire load. When the power load increases, the standby power supply will switch to active state to provide sufficient power to the system.

    To disable zero-output mode, start the Setup utility, go to System Settings > Power > Zero Output and select Disable. If you disable the zero-out mode, both power supplies will be in the active state.

  • Off: The server is powered off, or the power supply is not working properly. If the server is powered on but the LED is off, replace the power supply.

7 Power supply error LED

  • Yellow: The power supply has failed. To resolve the issue, replace the power supply.

  • Off: The power supply is working normally