The following illustration shows the locations of the power-supply LEDs.AC power LEDDC power LEDThe following table describes the problems that are indicated by variouscombinations of the power-supply LEDs and the power-on LED on the operatorinformation panel and suggested actions to correct the detected problems.v Follow the suggested actions in the order in which they are listed in the Action column until the problemis solved.v See Chapter 3, “Parts listing, Type 7979 and 1914 server,” on page 79 to determine which components arecustomer replaceable units (CRU) and which components are field replaceable units (FRU).v If an action step is preceded by “(Trained service technician only),” that step must be performed only by atrained service technician.Power-supplyLEDsOperatorinformationpanelpower-onLED Description ActionAC DCOff Off Off No power to theserver, or a problemwith the ac powersource.1. Check the ac power to the server.2. Make sure that the power cord is connected to afunctioning power source.3. Remove one power supply at a time.Lit Off Off DC source powerproblem. 1. Remove one power supply at a time.2. View the system error logs (see “Error logs” on page26).Lit Lit Off Standby powerproblem. 1. View the system error logs (see “Error logs” on page26).2. Remove one power supply at a time.3. Replace the power backplane.Lit Lit Lit The power is good. No action is necessary.Diagnostic programs, messages, and error codesThe diagnostic programs are the primary method of testing the major componentsof the server. As you run the diagnostic programs, text messages and error codesare displayed on the screen and are saved in the test log. A diagnostic textmessage or error code indicates that a problem has been detected; to determinewhat action you should take as a result of a message or error code, see the table in“Diagnostic error codes” on page 56.54 IBM System x3650 Type 7979 and 1914: Problem Determination and Service Guide
