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Chapter 5
Troubleshooting
Troubleshooting Tips
112
Troubleshooting Tips
WARNING Before removing a cover to service components that cannot be hot-swapped, always
disconnect the ac power cords and unplug telephone cables. Disconnect telephone
cables to avoid exposure to shock hazard from telephone ringing voltages.
Disconnect the ac power cords to avoid exposure to high energy levels that may
cause burns when parts are short-circuited by metal objects such as tools or jewelry.
CAUTION Do not operate the HP server for more than two minutes with any cover (including power
supplies and disk drives) removed. Otherwise, damage to server components may result due to
improper cooling airflow.
However, you can safely remove a cover while the HP server is running to remove and replace
PCI hot-plug boards. For any other service activity requiring access to the I/O baseboard or
power distribution board, power-down the HP server and observe all safety precautions.
Troubleshooting Methodology
Step 1. This is the entry point to the troubleshooting process. Here, you pick from a set of symptoms,
ranging from very simple (server LED is blinking) to the most difficult (Machine Check Abort
[MCA]) has occurred. The following is a list of symptom examples:
• Server LED blinking
• System Alert present on console
• Server will not power-up
• Server will not boot
• Event/Error Message received
• Machine Check Abort (MCA)
Step 2. This step narrows down the observed problem to the specific troubleshooting procedure required.
Here you isolate the failure to a specific part of the server so that you can perform more detailed
troubleshooting. For example:
• Problem-Server LED blinking
— System Alert on console?
— Analyze the alert by using the system event log (SEL) to identify the last error logged by
the baseboard management controller. Use the iLO MP commands to view the SEL.
Step 3. At this point you will have a good idea about which area of the server requires further analysis. For
example, if the symptom was “server will not power-up” then the initial troubleshooting procedure
may have indicated a problem with the dc power supply not coming up after the power switch was
turned on.