IBM System x3950 E Installation Manual

Also see for 8878: Problem determination and service guide

v Follow the suggested actions in the order in which they are listed in the Action column until the problemis solved.v See the parts listing in the Problem Determination and Service Guide 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.Symptom ActionThe server does not turn off. 1. Determine whether you are using an Advanced Configuration and PowerManagement (ACPI) or a non-ACPI operating system. If you are using anon-ACPI operating system, complete the following steps:a. Press Ctrl+Alt+Delete.b. Turn off the server by holding the power-control button for 5 seconds.c. Restart the server.d. If the server fails POST and the power-control button does not work,disconnect the ac power cord for 20 seconds; then, reconnect the ac powercord and restart the server.2. If the problem remains or if you are using an ACPI-aware operating system,suspect the I/O board.The server unexpectedly shutsdown, and the LEDs on theoperator information panel arenot lit.See the Problem Determination and Service Guide on the IBM System xDocumentation CD for more information.Serial port problemsFor more information about the serial port, see the User’s Guide on the IBM Systemx Documentation CD.v Follow the suggested actions in the order in which they are listed in the Action column until the problemis solved.v See the parts listing in the Problem Determination and Service Guide 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.Symptom ActionThe number of serial ports thatare identified by the operatingsystem is less than the numberof installed serial ports.1. Make sure that:v Each port is assigned a unique address in the Configuration/Setup Utilityprogram and none of the serial ports is disabled.v The serial-port adapter (if one is present) is seated correctly.2. Reseat the serial port adapter.3. Replace the serial port adapter.Chapter 6. Solving problems 71