IBM 8685 Hardware Maintenance Manual - Page 139

Chapter 6. Symptom-to-FRU index This index supports xSeries 255 servers. Notes: 1. Check the configuration before you replace a FRU. Configuration problems can cause false errors and symptoms. 2. For IBM devices not supported by this index, refer to the manual for that device. 3. Always start with "General checkout" on page 27. The symptom-to-FRU index lists symptoms, errors, and the possible causes. The most likely cause is listed first. Use this symptom-to-FRU index to help you decide which FRUs to have available when servicing the computer. The left-hand column of the tables in this index lists error codes or messages, and the right-hand column lists one or more suggested actions or FRUs to replace. Note: In tables with more than two columns, multiple columns are required to describe the error symptoms. Take the action (or replace the FRU) suggested first in the list of the right-hand column, then try the server again to see if the problem has been corrected before taking further action. Note: Try reseating a suspected component or reconnecting a cable before replacing the component. The POST BIOS code displays POST error codes and messages on the screen. Beep symptoms Beep symptoms are short tones or a series of short tones separated by pauses (intervals without sound). See the examples in the following table. Beeps 1-2-3 4 Description v One beep v A pause (or break) v Two beeps v A pause (or break) v Three beeps Four continuous beeps One beep after successfully completing POST indicates the system is functioning properly. Note: See "System" on page 162 to determine which components should be replaced by a field service technician. Beep/symptom FRU/action 1-1-2 (Microprocessor register test failed) 1. Optional microprocessor (if installed) 2. Microprocessor 3. System board © Copyright IBM Corp. 2002 129