The motherboard and modules that are installed on the motherboard contain several status indicators (LEDs), which are described in the following sections:
Each of the sixteen DDR3 DIMM slots on the motherboard has an amber fault status indicator (LED) associated with it. If Oracle ILOM determines that a DIMM is faulty, pressing the Fault Remind button on the motherboard signals the service processor to light the fault LEDs associated with the faulted DIMMs.
The motherboard includes a fault status indicator (LED) adjacent to each of the two processor sockets. These LEDs indicate when a processor is faulty. For example, if on reboot the BIOS detects that there are uncorrectable processor errors recorded in the machine check architecture (MCA) registers apparently left over from the previous boot, then the BIOS and Oracle ILOM work together to record and diagnose these errors. If it is determined that a processor is faulty, pressing the Fault Remind button on the motherboard signals the service processor to light the fault LED associated with the faulted processor.
This status indicator (LED) is located next to the Fault Remind button and is powered from the super capacitor that powers the fault LEDs on the motherboard. This LED lights to indicate that the fault remind circuitry is working properly in cases where no components have failed and, as a result, none of the component fault LEDs illuminate.
The service instructions for all internal components require that all AC power be removed from the power supplies prior to the server's top cover being removed. This green status indicator (LED) is labeled STBY PWRGD and is located on the rear of the server near PCIe slot 2.
Note - If a PCIe card is installed in PCIe slot 2, this LED might not be visible.
This LED lights to inform a service technician that the motherboard is receiving standby power from at least one of the power supplies. This indicator is provided to help prevent service actions on the server's internal components while the AC power cords are installed and power is being supplied to the server.