Light path diagnostics LEDs

The following table describes the LEDs on the light path diagnostics panel and suggested actions to correct the detected problems.

Look at the light path diagnostics panel on the front of the server. Lit LEDs on the light path diagnostics panel indicate the type of error that has occurred. The light path diagnostics panel LEDs are visible through the bezel.

Follow the suggested actions in the order in which they are listed in the Action column until the problem is solved.
If an action step is preceded by '(Trained technician only)', that step must be performed only by a Trained technician.
Go to the IBM support website at the Lenovo Support Portal to check for technical information, hints, tips, and new device drivers or to submit a request for information.

Table 1. Light path diagnostics panel LEDs.
Three column table for documenting the LED, description, and action.
LED	Description	Action
Hard disk drive/ RAID	A hard disk drive has failed or is missing. A SAS controller or a ServeRAID controller error has occurred.	Check the LEDs on the hard disk drives for the drive with a lit status LED and reseat the hard disk drive. Reseat the hard disk drive backplane. Check the LEDs near SAS controllers or ServeRAID controllers and reseat the corresponding controllers. For more information, see the . If the error remains, replace the following components one at a time, in the order listed, restarting the server after each: Replace the hard disk drive. Replace the hard disk drive backplane. Replace the SAS controller. Replace the ServeRAID controller. If the problem remains, go to the Lenovo Support Portal.
Fan	A fan has failed, is operating too slowly, or has been removed. The TEMP LED might also be lit.	Open the fan cage cover to reseat the failing fan (with lit LED). Replace the failing fan (see Installing a simple-swap fan).
Temperature	The system temperature has exceeded a threshold level. A failing fan can cause the Temperature LED to be lit.	Make sure that the heat sink is seated correctly. Determine whether a fan has failed. If it has failed, replace the failing fan. Make sure that the room temperature is not too high. See Server features and specifications for the server temperature information. Make sure that the air vents are not blocked. Make sure that the fan on the adapter and the network adapter is seated correctly. If it has failed, replace the failing component. If the failure remains, go to the Lenovo Support Portal.
Microprocessor	When only the Microprocessor LED is lit, a microprocessor has failed.	If the Configuration LED is not lit, a microprocessor failure occurs, complete the following steps: (Trained technician only) Make sure that the failing microprocessor and its heat sink, which are indicated by a lit LED on the system board, are installed correctly. See Installing a microprocessor and heat sink for information about installation and requirements. (Trained technician only) Replace the failing microprocessor (see Installing a microprocessor and heat sink). If the failure remains, go to the Lenovo Support Portal.
Microprocessor	Microprocessor + Configuration When both the Microprocessor and Configuration LEDs are lit, the microprocessor configuration is invalid.	If the Configuration LED and the Microprocessor LED are lit, the system issues an invalid microprocessor configuration error. Complete the following steps to correct the problem: Check the microprocessors that were just installed to make sure that they are compatible with each other (see Installing a microprocessor and heat sink for additional information about microprocessor requirements) and use the Setup utility and select System Information → System Summary → Processor Details to verify the microprocessors information. (Trained technician only) Replace the incompatible microprocessor. Check the system-error logs for information about the error. Replace any component that is identified in the error log.
Configuration	Configuration + Microprocessor A hardware configuration error has occurred.	If the Configuration LED and the Microprocessor LED are lit, complete the following steps to correct the problem: Check the microprocessors that were just installed to make sure that they are compatible with each other (see Installing a microprocessor and heat sink for additional information about microprocessor requirements). (Trained technician only) Replace the incompatible microprocessor. Check the system-event logs for information about the error (see Event logs). Replace any component that is identified in the error log.
	Configuration + Memory A hardware configuration error has occurred.	If the Configuration LED and the Memory LED are lit, check the system-event logs for information about the error (see Event logs).
	Configuration + Power supply A hardware configuration error has occurred.	If the Configuration LED and the Power supply LED are lit, the system issues an invalid power configuration error. Make sure that both power supplies installed in the server are of the same rating or wattage.
Memory	When only the Memory LED is lit, a memory error has occurred.	Note Each time you install or remove a DIMM, you must disconnect the server from the power source; then, wait 10 seconds before restarting the server. If the Configuration LED is not lit, the system might detect a memory error. Complete the following steps to correct the problem: Reseat or swap the DIMMs with lit LEDs. Check the system-event logs for information about the error (see Event logs). Update the server firmware to the latest level (see Updating the firmware for more information). Replace the failing DIMM (see Installing a DIMM).
Memory	Memory + Configuration When both the Memory and Configuration LEDs are lit, the memory configuration is invalid.	If the Memory LED and the Configuration LED are lit, check the system-event logs for information about the error (see Event logs).
Power supply	When only the Power supply LED is lit, a power supply has failed.	If the CONFIG LED is not lit, the system might detect a power supply error. Complete the following steps to correct the problem: Check the power-supply with an lit yellow LED (see Power-supply LEDs). Make sure that the power supplies are seated correctly and plugged in a good AC outlet. Remove one of the power supplies to isolate the failed power supply. Make sure that both power supplies installed in the server are of the same voltage. Replace the failed power supply (see Removing a hot-swap power supply).
Power supply	Power supply + Configuration When both the Power supply and Configuration LEDs are lit, the power supply configuration is invalid.	If the PS LED and the CONFIG LED are lit, the system issues an invalid power configuration error. Make sure that both power supplies installed in the server are of the same rating or wattage.
Over spec	The power supplies are using more power than their maximum rating.	If the Over spec LED on the light path diagnostics panel is lit, complete the following steps in order until the problem is solved: Add a second power supply. Replace the failed power supply. Remove the optional devices.
PCI	An error has occurred on a PCI card or a PCI bus.	Check if any PCI slot error LED is lit to identify the component that caused the error. Check the system-error log for information about the error (see Event logs). If you cannot isolate the failing component by using the LEDs and the information in the system-event logs, remove one component at a time; and restart the server after each component is removed. If the failure remains, go to the Lenovo Support Portal.
NMI	A nonmaskable interrupt has occurred, or the NMI button was pressed.	Check the system-event logs for information about the error (see Event logs). Restart the server.
System board	An error has occurred on the system battery, the microprocessor 2 expansion board, the power paddle card, or the system board.	Check the LEDs on the system board to identify the component that caused the error. The System board LED can be lit due to any of the following reasons: Battery (see Removing the system battery and Installing the system battery). Microprocessor 2 expansion board (see Removing the microprocessor 2 expansion board and Installing the microprocessor 2 expansion board). Power paddle card (see Removing the power paddle card and Installing the power paddle card). (Trained technician only) System board (see Removing the system board and Installing the system board). Check the system-event logs for information about the error. Replace the failing component: Battery Microprocessor 2 expansion board Power paddle card (Trained technician only) System board

Look at the system service label on the top of the server, which gives an overview of internal components that correspond to the LEDs on the light path diagnostics panel. This information can often provide enough information to diagnose the error.

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