The motherboard and modules that are installed on the motherboard contain several LEDs, which are described in the following sections:
Each of the 16 DDR3 DIMM sockets on the motherboard has an amber fault 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 LED adjacent to each of the two processor sockets. These LEDs indicate when a processor is faulty. Pressing the Fault Remind button on the motherboard signals the service processor to light the fault LEDs associated with the faulty processors.
This 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 LED is located on the motherboard near the rear of the server, and it 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 line cords are installed and power is being supplied to the server.