4. Turn on the server. If the problem remains, suspect the following components inthe following order:a. Power backplaneb. System boardIf 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.Problem determination tipsBecause of the variety of hardware and software combinations that you canencounter, use the following information to assist you in problem determination. Ifpossible, have this information available when you request assistance from IBM.v Machine type and modelv Microprocessor or hard disk upgradesv Failure symptom– Does the server fail the diagnostic tests?– What occurs? When? Where?– Does the failure occur on a single server or on multiple servers?– Is the failure repeatable?– Has this configuration ever worked?– What changes, if any, were made before the configuration failed?– Is this the original reported failure?v Diagnostic program type and version levelv Hardware configuration (print screen of the system summary)v BIOS code levelv Operating system type and version levelYou can solve some problems by comparing the configuration and software setupsbetween working and nonworking servers. When you compare servers to eachother for diagnostic purposes, consider them identical only if all the following factorsare exactly the same in all the servers:v Machine type and modelv BIOS levelv Adapters and attachments, in the same locationsv Address jumpers, terminators, and cablingv Software versions and levelsv Diagnostic program type and version levelv Configuration option settingsv Operating-system control-file setupSee Appendix A, “Getting help and technical assistance,” on page 223 forinformation about calling IBM for service.Chapter 5. Diagnostics 221
