Note: Damaged data in CMOS or damaged BIOS code can cause undeterminedproblems. If you suspect that the BIOS code is damaged, see “Recovering theBIOS code” on page 68.Note: Damaged data in BIOS code can cause undetermined problems.Check the LEDs on all the power supplies. If the LEDs indicate the power suppliesare working correctly, complete the following steps:1. Turn off the server.2. Be sure 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 each time):Any external devicesSurge suppressor device (on the server)Modem, printer, mouse, or non-IBM devicesEach adapterDrivesMemory modules (minimum requirement = 512 MB (2 banks of 256 MBDIMMs))Note: Minimum operating requirements are:a. One power supplyb. PCI riser cardc. PCI-X riser cardd. Power cage assemblye. System boardf. One microprocessor and VRMg. Memory module (with a minimum of two 256 MB DIMMs)4. Turn on the server. If the problem remains, suspect the following FRUs in theorder listed:Power supplyPower cage assemblySystem boardNotes:1. If the problem goes away when you remove an adapter from the system andreplacing that adapter does not correct the problem, suspect the system board.2. If you suspect a networking problem and all the system tests pass, suspect anetwork cabling problem external to the system.Problem determination tipsBecause of the variety of hardware and software combinations that can beencountered, use the following information to assist you in problem determination. Ifpossible, have this information available when requesting assistance from ServiceSupport and Engineering functions.v Machine type and modelv Microprocessor or hard disk upgradesv Failure symptom– Do diagnostics fail?– What message appears in the diagnostics log?– What, when, where, single, or multiple systems?– Is the failure repeatable?– Has this configuration ever worked?– If it has been working, what changes were made prior to it failing?Chapter 6. Symptom-to-FRU index 105
