IBM 84885BU User Manual - Page 137
Undetermined, problems
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Undetermined problems Use the information in this section if the diagnostic tests did not identify the failure, the devices list is incorrect, or the system is inoperative. Damaged data in CMOS memory or damaged BIOS code can cause undetermined problems. To reset the CMOS data, use the CMOS recovery jumper to override the power-on password and clear the CMOS memory; see "Erasing a lost or forgotten password (clearing CMOS)" on page 19. If you suspect that the BIOS code is damaged, see "Recovering from a POST/BIOS update failure" on page 18. Check the LEDs on all the power supplies. If the LEDs indicate the power supplies are 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 the failure (turn on the server and reconfigure each time): v Any external devices v Surge suppressor device (on the server) v Modem, printer, mouse, or non-IBM devices v Each adapter v Drives v Memory modules (minimum requirement = 512 MB (2 banks of 256 MB DIMMs)) Note: Minimum operating requirements are: a. One power supply b. Power cage assembly, if installed c. System board d. One microprocessor e. Memory module (with a minimum of two 256 MB DIMMs) 4. Turn on the server. If the problem remains, suspect the following FRUs in the order listed: v Power supply v Power cage assembly, if installed v System board Notes: 1. If the problem goes away when you remove an adapter from the system and replacing 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 a network cabling problem external to the system. Chapter 6. Symptom-to-FRU index 127