IBM eServer 260 Series Installation Manual page 63

The server is designed so that LEDs remain lit when the server is connected to an
ac power source but is not turned on, provided that the power supply is operating
correctly. This feature helps you to isolate the problem when the operating system
is shut down.
Any memory, microprocessor, or VRM LED can be lit again without ac power after
you remove the microprocessor tray so that you can isolate a problem. After ac
power has been removed from the server, power remains available to these LEDs
for up to 24 hours.
To view the memory, microprocessor, or VRM LEDs, press and hold the light path
diagnostics button on the memory card or on the microprocessor board briefly to
light the error LEDs.
The LEDs that were lit while the server was running will be lit again while the button
is pressed.
Many errors are first indicated by a lit information LED or system-error LED on the
operator information panel on the front of the server. If one or both of these LEDs
are lit, one or more LEDs elsewhere in the server might also be lit and can direct
you to the source of the error.
Before working inside the server to view light path diagnostics LEDs, read the
safety information that begins on page v and "Handling static-sensitive devices" on
page 8.
If an error occurs, view the light path diagnostics LEDs in the following order:
1. Check the operator information panel on the front of the server.
v If the information LED is lit, it indicates that information about a suboptimal
condition in the server is available in the BMC log or in the system-error log.
v If the system-error LED is lit, it indicates that an error has occurred; go to
step 3 on page 52.
The following illustration shows the operator information panel.
Power-control button
USB connector
Power-on LED
Hard disk drive activity LED
Locator LED
2. Unlock the front cover (tower model only) and remove the server cover to look
inside the server for lit LEDs. Certain components inside the server have LEDs
that will be lit to indicate the location of a problem. For example, a VRM error
will light the LED next to the failing VRM on the microprocessor tray.
The following illustration shows the LEDs and connectors on the microprocessor
tray.
Information LED
Release latch
System-error LED
Chapter 5. Solving problems
51