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Rear view LEDs

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

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

Figure 1. Rear view LEDs
Rear view LEDs

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

3 4 5 Power supply LEDs

Each hot-swap power supply has three status LEDs.

3 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 or a power problem occurs.

4 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 Advanced > 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.

5 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.

6 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 ThinkSystem System Manager or a remote management program to change the state of the system ID LEDs to assist in visually locating the server among other servers.

7 System error LED

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