IBM 436854u Service Guide - Page 247
Solving undetermined problems, One power supply
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Solving undetermined problems If the diagnostic tests did not diagnose the failure or if the server is inoperative, use the information in this section. If you suspect that a software problem is causing failures (continuous or intermittent), see "Software problems" on page 150. Damaged data in CMOS memory or damaged BIOS code can cause undetermined problems. To reset the CMOS data, use the clear CMOS jumper (JP2) to clear the CMOS memory; see "System-board jumpers" on page 13. If you suspect that the BIOS code is damaged, see "Updating (flash-update) the BIOS code on the server" on page 216. Check the LEDs on all the power supplies. If the LEDs indicate that 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 the failure. 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 one 512 MB DIMM on the system board. v Service processor. The following minimum configuration is required for the server to start: v One microprocessor v One 512 MB DIMM on the system board v One power supply v Power cord v Power backplane v System board 4. Turn on the server. If the problem remains, suspect the following components in the following order: a. System board b. Memory module c. Microprocessor d. SAS/SATA controller If the problem is solved when you remove an adapter from the server but the problem recurs when you reinstall the same adapter, suspect the adapter; if the problem recurs when you replace the adapter with a different one, suspect the system board or SAS/SATA controller. 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. Chapter 5. Diagnostics 229