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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 Chapter 3, "Parts listing, System x3755 Type 8877 and 7163," on page 25 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
The server emits a continuous
beep during POST, indicating
that the startup (boot)
microprocessor is not working
correctly.
Action
1. Correct any errors that are indicated by the light path diagnostics LEDs (see
"Light path diagnostics" on page 111).
2. Make sure that the server supports all the microprocessors and that the
microprocessors match in cache size and speed.
3. Reseat the microprocessor/memory cards, see "Removing a
microprocessor/memory card" on page 51 and "Replacing a
microprocessor/memory card" on page 51.
4. (Trained service technician only) Remove microprocessor 2 and restart the
server.
v If no beep code occurs, microprocessor 2 might have failed; replace the
microprocessor.
v If the beep code remains, remove microprocessor 1 and install
microprocessor 2 in the connector for microprocessor 1; then, restart the
server. If no beep code occurs, microprocessor 1 might have failed; replace
the microprocessor.
5. If there is no indication of which microprocessor has failed, isolate the error by
testing with one microprocessor/memory card at a time.
6. Replace the microprocessor/memory cards one at a time, restarting the server
each time. See "Removing a microprocessor/memory card" on page 51 and
"Replacing a microprocessor/memory card" on page 51.
7. If there are multiple error codes or light path diagnostics LEDs that indicate a
microprocessor error, reverse the location of two microprocessor/memory cards
to determine whether the error is associated with a microprocessor or with a
microprocessor/memory card connector.
v If the error is associated with a microprocessor, replace the
microprocessor/memory card. See "Removing a microprocessor/memory
card" on page 51 and "Replacing a microprocessor/memory card" on page
51.
v (Trained service technician only) If the error is associated with a
microprocessor/memory card connector, replace the I/O board, see
"Removing the I/O board assembly" on page 68 and "Replacing the I/O
board assembly" on page 69.
103
Chapter 5. Diagnostics
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