IBM 79856au Installation Guide - Page 80

Microprocessor problems v Follow the suggested actions in the order in which they are listed in the Action column until the problem is solved. v See the parts listing in the Problem Determination and Service Guide to determine which components are customer replaceable units (CRU) and which components are field replaceable units (FRU). v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a trained service technician. Symptom Action The server emits a continuous beep during POST, indicating that the microprocessor is not working correctly. 1. Correct any errors that are indicated by the light path diagnostics LEDs (see "Light path diagnostics" on page 73). 2. Make sure that the server supports all the microprocessors and that the microprocessors match in speed and cache size. 3. (Trained service technician only) Make sure that microprocessor 1 is seated correctly. 4. If there is no indication of which microprocessor has failed, isolate the error by testing with one microprocessor at a time. 5. (Trained service technician only) If there are multiple error codes or light path diagnostics LEDs that indicate a microprocessor error, reverse the locations of two microprocessors to determine whether the error is associated with a microprocessor or with a microprocessor socket. v If the error is associated with a microprocessor, replace the microprocessor. v If the error is associated with a microprocessor socket, replace the system board. 66 IBM System x3655 Type 7985: Installation Guide