Each 10Gb ethernet connector has two status LEDs.
Ethernet status LED
Color Status
Description
4  Ethernet link LED Green On Network link is established.
None
Off
Network link is disconnected.
5  Ethernet activity LED
Green
Blinking Network link is connected and active.
None Off The server is disconnected from a LAN.
6  System ID LED (blue)
Use this blue system ID LED 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 on the front panel, 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.
If the XClarity Controller USB connector is set to have both the USB 2.0 function and XClarity Controller 
management function, you can press the system ID button for three seconds to switch between the two 
functions.
7  Ethernet link LED (green)  8  Ethernet activity LED (green)
Each network connector has two status LEDs.
Ethernet status LED
Color Status
Description
7  Ethernet link LED
Green On
Network link is established.
None
Off
Network link is disconnected.
8  Ethernet activity LED
Green
Blinking Network link is connected and active.
None Off The server is disconnected from a LAN.
Power supply LEDs
This topic provides information about various power supply LED status and corresponding action 
suggestions. 
The following minimum configuration is required for the server to start:
•  One processor in processor socket 1 (processor TDP smaller than 200 watts)
•  One DRAM DIMM in DIMM slot 10
•  One power supply unit in PSU slot 1
•  One drive with RAID adapter and backplane (if OS is needed for debugging)
•  Three single rotor fans in fan slots 1, 2, and 4, and one fan filler in fan slot 3
The following table describes the problems that are indicated by various combinations of the power-supply 
LEDs and the power-on LED on the front operator panel and suggested actions to correct the detected 
problems.
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ThinkSystem ST650 V3 System Configuration Guide