Table 20. Components associated with power rail error (continued)Pwr rail error in theIMM2 event log ComponentsPwr rail 3 error Microprocessor 2Pwr rail 4 error Fan 4, and DIMMs 1 through 12Pwr rail 5 error For the hot-swap power-supplie systems: Hard disk drives, harddisk drive backplane assembly, and optional DVD or Tape drive.v Replace the identified component.4. Reconnect all power cords and turn on the server. If the server startssuccessfully, replace the adapters and devices one at a time until the problem isisolated.5. Remove the adapters and disconnect the cables and power cords to all internaland external devices until the server is at the minimum configuration that isrequired for the server to start (see “Power-supply LEDs” on page 21 for theminimum configuration.)6. Reconnect all ac power cords and turn on the server. If the server startssuccessfully, reseat the adapters and devices one at a time until the problem isisolated.If the server does not start from the minimum configuration, see “Power-supplyLEDs” on page 21 to replace the components in the minimum configuration one ata time until the problem is isolated.Solving Ethernet controller problemsThe method that you use to test the Ethernet controller depends on whichoperating system you are using. See the operating-system documentation forinformation about Ethernet controllers, and see the Ethernet controllerdevice-driver readme file.Try the following procedures:v Make sure that the correct device drivers, which come with the server areinstalled and that they are at the latest level.v Make sure that the Ethernet cable is installed correctly.– The cable must be securely attached at all connections. If the cable is attachedbut the problem remains, try a different cable.– If you set the Ethernet controller to operate at 100 Mbps, you must useCategory 5 cabling.– If you directly connect two servers (without a hub), or if you are not using ahub with X ports, use a crossover cable. To determine whether a hub has an Xport, check the port label. If the label contains an X, the hub has an X port.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 panel of the server. These LEDsindicate whether there is a problem with the connector, cable, or hub.– The Ethernet link status LED is lit when the Ethernet controller receives a linkpulse from the hub. If the LED is off, there might be a defective connector orcable or a problem with the hub.– The Ethernet transmit/receive activity LED is lit when the Ethernet controllersends or receives data over the Ethernet network. If the Ethernettransmit/receive activity is off, make sure that the hub and network areoperating and that the correct device drivers are installed.Chapter 4. Troubleshooting 297
