Check the LEDs on all the power supplies (see “Power-supply LEDs” on page 58).If the LEDs indicate that the power supplies are working correctly, complete thefollowing steps:1. Check the operator information panel and light path diagnostic LEDs.2. View error logs.3. Turn off the server.4. Make sure that the server is cabled correctly.5. Remove or disconnect the following devices, one at a time, until you find thefailure. Turn on the server and reconfigure it each time.v Any external devices.v Surge-suppressor device (on the server).v Modem, printer, mouse, and non-IBM devices.v Each adapter.v Hard disk drives.v Memory modules. The minimum configuration requirement is 2 GB (two 1 GBDIMMs).v Baseboard management controller.The following minimum configuration is required for the server to power on:v One microprocessor in microprocessor connector 1v Two 1 GB DIMMs on memory card 1v One power supplyv Power backplanev One power cordv I/O boardv PCI board6. Turn on the server. If the problem remains, suspect the following components inthe following order:a. Power backplaneb. I/O boardc. Memory cardd. Microprocessor trayIf the problem is solved when you remove an adapter from the server but theproblem recurs when you reinstall the same adapter, suspect the adapter; if theproblem recurs when you replace the adapter with a different one, suspect the PCIboard.If you suspect a networking problem and the server passes all the system tests,suspect a network cabling problem that is external to the server.Calling IBM for serviceSee Appendix A, “Getting help and technical assistance,” on page 167 forinformation about calling IBM for service.When you call for service, have as much of the following information available aspossible:v Machine type and modelv Microprocessor and hard disk drive upgradesv Failure symptoms– Does the server fail the diagnostic programs? If so, what are the error codes?– What occurs? When? Where?– Is the failure repeatable?Chapter 2. Diagnostics 105
