Table 5. Power-supply LEDs (continued)Power-supply LEDsDescription Action NotesAC DC ErrorOn Off Off Power supplynot fully seated,faulty systemboard, or faultypower supply1. Reseat the power supply.2. If the system-board error LED is off,replace the power supply.3. (Trained service technician only) If thesystem-board error LED is lit, replacethe system board.This typicallyindicates that apower supply is notfully seated.On Off orFlashingOn Faulty powersupplyReplace the power supply.On On Off NormaloperationOn On On Power supply isfaulty but stilloperationalReplace the power supply.Server power featuresThis topic provides guidelines for server power features.When the server is connected to an ac power source but is not turned on, theoperating system does not run, and all core logic except for the service processor isshut down; however, the server can respond to requests from the service processor,such as a remote request to turn on the server. The power-on LED flashes toindicate that the server is connected to ac power but not turned on.In a two-node configuration, connect both servers to an ac power source as close tothe same time as possible to ensure optimum operation.Turning on the serverThis topic provides instructions for how to turn on the server.A scaled system takes longer to power-on then a stand alone system.Approximately 30 seconds for a stand alone server, or up to 8 minutes in a 2-nodeconfiguration, after the server is connected to ac power, the power-control buttonbecomes active, and one or more fans might start running to provide cooling whilethe server is connected to power. You can turn on the server and all nodes in thepartition and start the operating system by pressing the power-control button.Note: Do not power the server off when b:b/0:0 is flashing on the front panel.This indicates that setup/configuration is in process.If you are restarting a two-node server after it has been turned off, you must allowextra time for the hardware to synchronize before you turn on the server again.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 The systems-management software can turn on the server remotely.v If your operating system supports the Wake on LAN feature, the Wake on LANfeature can turn on the server.20 IBM System x3850 X5 and x3950 X5 Types 7145, 7146, 7143, and 7191: Problem Determination and Service Guide
