IBM xSeries 346 Hardware Maintenance Manual And Troubleshooting Manual

Also see for xSeries 346: Installation guide User guide Configuration and options guide Option installation guide User guide

Contents

A general procedure for troubleshooting power problems is as follows:1. Turn off the server, and disconnect all ac power cords.2. Check for loose cables in the power subsystem. Also check for short circuits, forexample, if there is a loose screw causing a short circuit on a circuit board.3. Remove adapters, and disconnect the cables and power connectors to allinternal and external devices until the server is at the minimum configurationrequired to start the server (see “Minimum operating requirements” on page103).4. Reconnect all ac power cords, and turn on the server. If the server starts upsuccessfully, replace adapters and devices one at a time until the problem isisolated. If the server does not start up from the minimal configuration, replaceFRUs of minimal configuration one at a time until the problem is isolated.To use this method, it is important to know the minimum configuration required for asystem to start (see page 103). For specific problems, see “Power-supply LEDerrors” on page 98.Troubleshooting the Ethernet controllerThis section provides troubleshooting information for problems that might occur withthe 10/100/1000 Mbps Ethernet controller.Network connection problemsIf the Ethernet controller cannot connect to the network, check the followingconditions:v Make sure that the cable is installed correctly.The network cable must be securely attached at all connections. If the cable isattached but the problem remains, try a different cable.If you set the Ethernet controller to operate at either 100 Mbps or 1000 Mbps,you must use Category 5 or higher cabling.v Determine whether the hub supports auto-negotiation. If it does not, tryconfiguring the integrated Ethernet controller manually to match the speed andduplex mode of the hub.v Check the Ethernet controller LEDs on the rear of the server.These LEDs indicate whether there is a problem with the connector, cable, orhub:– The Ethernet transmit/receive activity LED, on the rear of the server, is litwhen the Ethernet controller sends or receives data over the EthernetNetwork. If the Ethernet transmit/receive activity LED is off, make sure thatthe hub and network are operating and that the correct device drivers areinstalled.– The Ethernet link status LED, on the rear of the server, is lit when theEthernet controller receives a LINK pulse from the hub. If the LED is off, theremight be a defective connector or cable or a problem with the hub.v Make sure that you are using the correct device drivers, which are supplied withthe server.v Check for operating-system-specific causes for the problem.v Make sure that the device drivers on the client and server are using the sameprotocol.v Test the Ethernet controller.The way the Ethernet controller is tested depends on which operating systemyou are using (see the Ethernet controller device driver readme files).20 xSeries 346 Types 8840 and 1880: Hardware Maintenance Manual and Troubleshooting Guide