Chapter 6
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6 Troubleshooting
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 10 minutes with any cover (including power supplies and disk
drives) removed. Otherwise, damage to system 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 system board 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 (System LED is blinking) to the most difficult Machine Check Abort (MCA) has occured. The following is
a list of symptom examples:
• System LED blinking
• System Alert present on console
• System will not power-up
• System 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-System 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 either the EFI shell command line interface (CLI) or the optional
management processor card is installed, use the MP commands to view the SEL.
Step 3. At this point you will have a good idea about which area of the system requires further analysis. For example, if
the symptom was “system 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.
Step 4. You have now reached the point where the failed Field Replaceable Unit (FRU or FRUs) have been identified and
need to be replaced. You must now perform the specific remove-and-replace verification steps.
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