Solving undetermined problemsIf the diagnostic tests did not diagnose the failure or if the server is inoperative, usethe information in this section.If you suspect that a software problem is causing failures (continuous orintermittent), see “Software problems” on page 34.Damaged data in CMOS memory or damaged BIOS code can cause undeterminedproblems. To reset the CMOS data, use the clear-CMOS jumper to clear the CMOSmemory and override the power-on password; see “System-board switches andjumpers” on page 7. If you suspect that the BIOS code is damaged, see“Recovering from BIOS update failure” on page 46.If the power supplies are working correctly, complete the following steps:1. Turn off the server.2. Make sure that the server is cabled correctly.3. 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 512 MB (one512 MB DIMM in DIMM slot 1).The following minimum configuration is required for the server to turn on:v One microprocessorv One 512 MB DIMM on the system boardv One power supplyv Power cordv System board4. Turn on the server. If the problem remains, suspect the following components inthe following order:a. System boardb. Memory modulec. Microprocessord. PCI-X expansion cardIf 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 risercard.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 111 forinformation about calling IBM for service.When you call for service, have as much of the following information available aspossible:v Machine type and modelChapter 2. Diagnostics 57
