In multi-node configurations, you can also press this button during startup to start
the server as a stand-alone server.
Light path diagnostics LEDs
This topic provides a table that describes the LEDs on the light path diagnostics
panel.
The following table describes the LEDs on the light path diagnostics panel. If the
information LED or system-error LED on the front of the server is lit, determine
whether any LEDs on the light path diagnostics panel are lit, and then refer to this
table for the suggested action to correct the detected problem.
v Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
v See Chapter 4, “Parts listing, Types 7145, 7146, 7143, and 7191,” on page 81 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.
Light path
diagnostics LED Description Action
All LEDs are off (only
the power LED is lit
or flashing).
No action is necessary.
All LEDs are off (the
power LED is lit or
flashing and the
system-error LED is
lit).
A machine check has occurred. The
server is identifying the machine
check, the server was interrupted
while identifying the machine
check, or the server was unable to
identify the machine check.
1. Wait several minutes for the server to identify the
machine check, and the server will restart.
2. (Trained service technician only) Extract the
machine check data, which will be used to identify
the machine check.
OVERSPEC There is insufficient power to
power the system. The LOG LED
might also be lit.
1. Add a power supply if only one power supply is
installed.
2. Use 220 V ac instead of 110 V ac.
3. Reseat the power supply (see “Removing a
hot-swap power supply” on page 123 and
“Replacing the hot-swap power supply” on page
127).
4. Remove optional devices.
5. Replace the power supply.
LOG Information is present in the
system-event log.
1. Check the log for possible errors.
2. Save the log if necessary and clear it.
Chapter 3. Diagnostics 63
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