There are several LEDs on the rear of the server.
The following illustration shows the LEDs on the rear view of server models without the rear hot-swap drive assembly. The LEDs on the rear view of server models with the rear hot-swap drive assembly are the same.
Figure 1. LEDs on the rear of the server
Table 1. LEDs on the rear of the server| 1 System ID LED | 2 System error LED |
| 3 Ethernet link LED | 4 Ethernet activity LED |
| 5 Power input LED | 6 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
For the detailed information, see Front I/O assembly.
3 Ethernet link LED
4 Ethernet activity LED
Each Ethernet connector has two status LEDs.
| Ethernet status LED | Color | Status | Description |
|---|
| 3 Ethernet link LED | Green | On | Network link is established. |
| None | Off | Network link is disconnected. |
| 4 Ethernet activity LED | Green | Blinking | Network link is connected and active. |
| None | Off | The server is disconnected from a LAN. |
5 Power input LED
6 Power output LED
7 Power supply error LED
Each hot-swap power supply has three status LEDs.
| LED | Description |
|---|
| 5 Power input LED | |
| 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 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 output status 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
|