Error LEDs
The system board has error LEDs that will help to locate the source of the error
(see “System-board LEDs” on page 12). Run the diagnostic programs to find out
the cause of the error (see “Running the diagnostic programs” on page 43).
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.
Many errors are first indicated by a lit system-error LED on the front-panel
assembly of the server. If this LED is lit, one or more LEDs elsewhere in the server
might also be lit and can direct you to the source of the error.
Important: If the system-error LED on the front of the server is lit but there are no
other error indications, clear the BMC system-event log. This log does not clear
itself, and if it begins to fill up, the system-error LED will be lit. Also, after you
complete a repair or correct an error, clear the BMC system-event log to turn off the
system-error LED on the front of the server.
Before you work inside the server to view the LEDs, read the safety information that
begins on page vii and “Handling static-sensitive devices” on page 76.
If an error occurs, view the server LEDs in the following order:
1. Check the front-panel assembly on the front of the server. If the system-error
LED is lit, it indicates that an error has occurred.
2. Check the front and rear of the server to determine whether any component
LEDs are lit.
3. Remove the server cover and 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 DIMM error will light the LED next to the failing
DIMM on the system board.
Look at the system service label on the top of the server, which gives an
overview of internal components. This information can often provide enough
information to correct the error.
42 System x3200 Types 4362 and 4363: Problem Determination and Service Guide
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