Lenovo ThinkSystem SR850 - Light Path Diagnostics

Light path diagnostics
Light path diagnostics is a system of LEDs on various external and internal components of the server that
leads you to the failed component. When an error occurs, LEDs are lit on the front operator panel on the front
of the server, then on the failed component. By viewing the LEDs in a particular order, you can often identify
the source of the error.
The following illustration shows the light path diagnostic LEDs for the server, which are located on the
operator information panel.
Figure 128. Front operator panel
Table 44. Light path diagnostics: LED status and actions
LED
Description
Action
1 Power button/LED
(green)
Off: No power supply is properly
installed, or the LED itself has failed.
Flashing rapidly (4 times per second):
The server is turned off and is not ready
to be turned on. The power-control
button is disabled. This will last
approximately 5 to 10 seconds.
Flashing slowly (once per second):
The server is turned off and is ready to
be turned on. You can press the power-
control button to turn on the server.
Lit: The server is turned on.
Press the power button to turn the server
on and off manually.
2 Network activity LED
(green)
LED on: The server is transmitting to or
receiving signals from the Ethernet LAN.
Use this LED to identify network
connection status.
Chapter 4. Problem determination 137