System-board LEDsThe following illustration shows the light-emitting diodes (LEDs) on the systemboard.DIMM 1DIMM 2DIMM 3DIMM 4MicroprocessorIMM2 hearbeatLEDRTMMHearbeat LEDDIMM 1 - 4error LEDsMicroprocessorerror LEDStandby powerLEDSystem boarderror LEDNote: When you disconnect the power source from the server, you lose the abilityto view the LEDs because the LEDs are not lit when the power source isremoved. Before you disconnect the power source, make a note of whichLEDs are lit, including the LEDs that are lit on the operation informationpanel and LEDs inside the server on the system board.Table 3. System-board LEDsLED DescriptionStandby power LED When this LED is lit, it indicates that the server is connectedto ac power.DIMM error LEDs A memory DIMM has failed or is incorrectly installed.Microprocessor error LED Microprocessor has failed, is missing, or has been incorrectlyinstalled.System-board error LED System-board CPU VRD and/or power voltage regulatorshave failed.IMM2 heartbeat LED Indicates the status of the boot process of the IMM2.When the server is connected to power this LED flashesquickly to indicate that the IMM2 code is loading. When theloading is complete, the LED stops flashing briefly and thenflashes slowly to indicate that the IMM2 if fully operationaland you can press the power-control button to start theserver.RTMM heartbeat LED power-on and power-off sequencing.24 IBM System x3250 M4 Type 2583: Installation and User’s Guide
