Press the reset button to reset the server and run the power-on self-test (POST).
You might have to use a pen or the end of a straightened paper clip to press the
button.
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, and 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, and VRM LEDs, press and hold the
light-path-diagnostics button on the memory card, or microprocessor board to light
the error LEDs.
The LEDs that were lit while the server was running will be lit again while the button
is pressed.
Diagnosing problems using light path diagnostics
LEDs in three locations on the server are available to help you diagnose problems
that might occur during installation. Use them in the following order:
1. Operator information panel - Look at this panel first. If an error has occurred,
the information LED or the system-error LED is lit.
2. Light path diagnostics panel - Move the latch on the right front of the operator
information panel to access the light path diagnostics panel. Note any LEDs that
are lit, and then close the panel. For LED locations, see the illustration on page
48.
3. LEDs inside the server - To identify the component that is causing the error,
note the lit LED beside or on the component.
Light path diagnostics panel
The following table lists the LEDs on the light path diagnostics panel, the problems
that they indicate, and actions to solve the problems.
v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See the parts listing in the Problem Determination and Service Guide to determine which components are
customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
Lit light path
diagnostics LED with
the system-error LED
also lit Description Action
All LEDs off (the
power LED is lit; the
information LED might
be lit).
No action necessary.
Chapter 6. Solving problems 61
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