Chapter 5
Troubleshooting
Troubleshooting and FRU identification
113
Troubleshooting and FRU identification
Once you have determined the current server state, you must troubleshoot the server to determine what the
problem symptoms are and what repair actions to take.
Use Table 5-1 to assist you in repairing the server by matching the problem symptom with the appropriate
troubleshooting step.
Table 5-1
Problem Symptoms Repair Actions
Problem or
Symptom
Problem
Indicators
Normal
Functioning
Indicators
Troubleshooting Steps
Potential FRUs
No indication of
housekeeping
voltage present
when AC is
connected and
power switch is
in the off
position.
Standby
LED is off
when AC is
plugged into
server. BMC
“heartbeat”
not flashing.
Both LEDs
are located
on the
system
board, see
System
Board LEDs
later in
chapter.
Power LED Off.
Power LED on
iLO MP card (if
installed) should
be lit solid green.
Standby LED on
system board is
on steady.
BMC “heartbeat”
LED on system
board is
flashing.(if
installed) should
be lit solid green.
1. AC must be present.
Check that PDU is
plugged in.
2. Ensure there is a working
power supply. The LED on
the supply should be lit.
3. Check for an EFI shell
prompt (CTRL B) at
console).
No AC present
Power Supply
Power
Distribution
System board
Display board
System won’t
power on when
display panel
Power switch is
turned on.
Display
panel Power
LED stays
off when
power is
turned on.
System LED
may be
flashing
yellow
(Attention
indication).
Power switch on.
Power LED on
steady green.
System LED is
off.
1. Ensure there is a working
power supply. The LED on
the supply should be lit.
2. Verify that standby
voltage is present. Check
that the STBY LED on the
system board is lit.
3. Verify that the baseboard
management controller is
functioning. Check the
heartbeat (BMC) LED on
the system board is lit.
4. Check server event log
(SEL). Look for event log
detail = Low Voltage DC
power. This indicates a
failure of one of the CPU
power pods.
Missing FRU
Power Supply
CPU power pod
System board
Intrusion switch
on chassis (cover
not completely
closed)