Note: If this LED is off, it does not mean that there is no electrical power in the
server. The LED might be burned out. To remove all electrical power from the
server, you must disconnect the power cord from the electrical outlet.
v Ethernet icon LED: This LED lights the Ethernet icon.
v Ethernet activity LEDs: When any of these LEDs is lit, it indicates that the
server is transmitting to or receiving signals from the Ethernet LAN that is
connected to the Ethernet port that corresponds to that LED.
v Information LED: When this LED is lit, it indicates that a noncritical event has
occurred. An LED on the light path diagnostics panel is also lit to help isolate the
error.
v System-error LED: When this LED is lit, it indicates that a system error has
occurred. An LED on the light path diagnostics panel is also lit to help isolate the
error.
v Release latch: Slide this latch to the left to access the light path diagnostics
panel, which is behind the operator information panel.
v Locator button and locator LED: Use this LED to visually locate the server
among other servers. It is also used as the physical presence for Trusted
Platform Module (TPM). Press this button to turn on or turn off this LED locally.
You can use IBM Systems Director to light this LED remotely.
Light path diagnostics panel
The light path diagnostics panel is on the top of the operator information panel.
To access the light path diagnostics panel, slide the blue release button on the
operator information panel to the left. Pull forward on the operator information panel
until the hinge of the panel is free of the server chassis. Then pull down on the
operator information panel, so that you can view the light path diagnostics panel
information.
Operator information
panel
Light path
diagnostics LEDs
Release latch
The following illustration shows the controls and LEDs on the light path diagnostics
panel.
Notes:
1. Do not run the server for an extended period of time while the light path
diagnostics panel is pulled out of the server.
2. Light path diagnostics LEDs remain lit only while the server is connected to
power.
Chapter 2. Introduction 11
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