Rear view LEDs

The illustration in this section shows the LEDs on the rear the server.

Figure 1. Rear view LEDs of the server

Table 1. LEDs on the rear of the server

Callout	Callout
1 Ethernet link LED (green)	2 Ethernet activity LED (green)
3 System ID LED (blue)	4 Power input LED (green)
5 Power output LED (green)	6 Power supply error LED (yellow)

1 2 Ethernet status LEDs

Each network connector has two status LEDs.

Ethernet status LED	Color	Status	Description
1 Ethernet link LED	Green	On	Network link is established.
	None	Off	Network link is disconnected.
2 Ethernet activity LED	Green	Blinking	Network link is connected and active.
	None	Off	The server is disconnected from a LAN.

3 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.

4 Power input LED5 Power output LED6 Power supply error LED

Each hot-swap power supply has three status LEDs.

LED	Description
4 Power input LED	Off: The power supply is disconnected from the ac power source or a power problem occurs. Green: The power supply is connected to the ac power source.
5 Power output LED	Green: The server is on and the power supply is working normally. Blinking green: The power supply is in 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 entire load. When the power load increases, the standby power supply will switch to active state to provide sufficient power to the server. To disable zero-output mode, start the Setup utility, go to System Settings > Power > Zero Output and select Disable. If you disable zero-output 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 power output LED is off, replace the power supply.
6 Power supply error LED	Off: The power supply is working normally. Yellow: The power supply has failed. To resolve the issue, replace the power supply.