Many errors are first indicated by a lit information LED or system-error LED on theoperator information panel on the front of the server. If one or both of these LEDsare lit, one or more LEDs elsewhere in the server might also be lit and can directyou to the source of the error.Note: Read the safety information beginning on page vii and “Handlingstatic-sensitive devices” on page 100.View the LEDs in the following order:1. Check the operator information panel on the front of the server.v If the information LED is lit, it indicates that information about a suboptimalcondition in the server is available in the BMC log or in the system-error log.Important: If the server has a baseboard management controller, clear theBMC log and system-event log after you resolve all conditions. This will turnoff the information LED and LOG LED, if all conditions are resolved.v If the system-error LED is lit, it indicates that an error has occurred; go tostep 2.The following illustration shows the operator information panel.Power-control buttonPower-on LEDUSB connectorHard disk drive activity LEDInformation LEDSystem-error LEDLocator LEDRelease latch2. To view the light path diagnostics panel, press the release latch on the front ofthe operator information panel to the left; then, slide it forward. This reveals thelight path diagnostics panel. Lit LEDs on this panel indicate the type of error thathas occurred.DASDNMIPCIBRD I/OBRDPSNONREDSPLINKRAIDMEMCPUCPUBRDFANPCIVRMOVER SPECTEMPREMIND LOGLight PathDiagnosticsLook at the system service label on the top of the server, which gives anoverview of internal components that correspond to the LEDs on the light pathChapter 2. Diagnostics 49
