Table 2. Power-supply LEDs status and required action (continued)Power-supply LEDsDescription Action NotesAC(green) DC (green)Error(yellow)Off Off On No ac power to theserver or a problemwith the ac powersource and thepower supply haddetected aninternal problem1. Replace the power supply.2. Make sure that the powercord is connected to afunctioning power source.This happens onlywhen a second powersupply is providingpower to the server.Off On Off Faultypower-supplyReplace the power supply.Off On On Faultypower-supplyReplace the power supply.On Off Off Power supply notfully seated, faultysystem board,faulty powersupply, or systemnot power-on1. Reseat the power supply.2. Replace the power supply.3. (Trained service technicianonly) Replace the systemboard.Typically indicatesthat a power supplyis not fully seated.On Off orFlashingOn Faulty powersupplyReplace the power supply.On On On Power supply isfaulty but stilloperationalReplace the power supply.Server power featuresWhen the server is connected to a power source but is not turned on, the operatingsystem does not run, and all core logic except for the integrated managementmodule II (IMM2) is shut down.However, the server can respond to requests from the IMM2, such as a remoterequest to turn on the server. The power-on LED flashes to indicate that the serveris connected to power but is not turned on.Turning on the serverUse this information to turn on the server.Approximately 40 seconds after the server is connected to power, thepower-control button becomes active, and one or more fans might start running toprovide cooling while the server is connected to power. You can turn on the serverand start the operating system by pressing the power-control button.The server can also be turned on in any of the following ways:v If a power failure occurs while the server is turned on, the server will restartautomatically when power is restored.v If your operating system supports the Wake on LAN feature, the Wake on LANfeature can turn on the server.For 32-bit operating systems only: Some memory is reserved for various systemresources and is unavailable to the operating system. The amount of memory thatis reserved for system resources depends on the operating system, theChapter 1. The IBM System x3650 M4 BD Type 5466 server 21
