IBM 8681 Hardware Maintenance Manual - Page 224

power supplies in its original configuration, swap removed FRUs with those currently installed in the minimum partial-boot configuration and reboot to see if there is any change in system behavior. If the system boots to the IBM logo screen after swapping a FRU, the last FRU removed is the failing FRU. Swap FRUs one at a time in this order: 1) Power supplies 2) Processors 3) Processor terminator cards 4) Processor daughter boards 5) Memory boards 6) DIMMs b. Continue with this step until the failing FRU has been identified, or all multiple FRUs have been cycled through the minimum partial-boot configuration. c. If the failing FRU has been identified, replace it and go to 12. d. If all multiple FRUs have been cycled through the minimum partial-boot configuration and the failing FRU has not been identified, go to 11. 11. One of the FRUs remaining in the configuration is the failing FRU. Replace FRUs in the order listed below. The FRU which allows the system to boot as far as the IBM logo screen is the failing FRU: a. Memory board (if the original configuration had only one) b. DIMM (if the original configuration had only one) c. Processor (if the original configuration had only one) d. Processor terminator card (if the original configuration had only one) e. Processor daughter board (if the original configuration had only one) f. Processor controller board g. I/O board h. I/O function card i. Power control card j. Midplane 12. Restore the server to its original configuration. 13. Retest the system without external devices attached. 14. Attach external devices. 15. Verify the system repair and return the system to the customer. 16. If the system will boot at least as far as the IBM Logo screen, consider the following note and continue with 17 on page 217. 216 Netfinity Server HMM