Light Path Diagnostics; General Problem Determination Procedures - Lenovo ThinkSystem SR635 Maintenance Manual

http://sysmgt.lenovofiles.com/help/topic/com.lenovo.lxca.doc/events_vieweventlog.html
ThinkSystem System Manager event log
The ThinkSystem System Manager monitors the physical state of the server and its components using
sensors that measure internal physical variables such as temperature, power-supply voltages, fan speeds,
and component status. The ThinkSystem System Manager provides various interfaces to system
management software and to system administrators and users to enable remote management and control of
a server.
Figure 181. ThinkSystem System Manager event log
For more information about accessing the ThinkSystem System Manager event log, see:
https://thinksystem.lenovofiles.com/help/topic/7Y98/bmc_user_guide.pdf

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 I/O assembly, the rear
panel, the system board, and the failed component. By viewing the following LEDs, you can often identify the
system and device status and diagnose problems.
• "Operator information panel" on page 15
• "Rear view LEDs" on page 20
• "System board LEDs" on page 24

General problem determination procedures

Use the information in this section to resolve problems if the event log does not contain specific errors or the
server is inoperative.
If you are not sure about the cause of a problem and the power supplies are working correctly, complete the
following steps to attempt to resolve the problem:
1. Power off the server.
2. Make sure that the server is cabled correctly.
ThinkSystem SR635 Maintenance Manual
206