IBM 86624RY Maintenance Manual - Page 333

Undetermined problems You are here because the diagnostic tests did not identify the failure, the Devices List is incorrect, or the system is inoperative. Notes 1. If you suspect a software mismatch is causing failures (solid or intermittent), be sure to see "Resolving configuration conflicts" on page 33. 2. A corrupt CMOS can cause undetermined problems. Check the LEDs on all the power supplies, see "Power supply LED errors" on page 301. If the LEDs indicate the power supplies are working correctly, return here and do the following: 1. Power-off the computer. 2. Be sure the system is cabled correctly. 3. Remove or disconnect the following (one at a time) until you find the failure (power-on the computer and reconfigure each time). Any external devices Surge suppressor device (on the computer) Modem, printer, mouse, or non-IBM devices Each adapter Drives Memory-Modules (Minimum requirement = 1 bank of 128 MB DIMMs) Note Minimum operating requirements are: Power Supply Power Backplane System Board (With pins 2 and 3 on J32's extension cable connected together to bypass the power switch. The default is pins 1 and 2.) Processor Board (Verify that the J32, J33, and J35 connectors are installed correctly.) Memory Module (With a minimum of 1 bank of 128 MB DIMMs) 1 Microprocessor and VRMs 3 Terminator Cards 4. Power-on the computer. If the problem remains, suspect the following FRUs in the order listed: Power Supply Power Backplane System Board Processor Board Netfinity 5500 M20 - Type 8662 325