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, Type 8864,” on page 23 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 startup (boot)
microprocessor is not working
correctly.
1. Correct any errors indicated by the light path (see “Light path diagnostics” on
page 101).
2. Make sure that all microprocessors are supported on this server, and that they
all match in speed and cache size.
3. (Trained service technician only) Make sure that the microprocessor 1 is seated
correctly.
4. Make sure the following components are seated correctly:
a. (Trained service technician only) Microprocessor 1
b. Microprocessor VRM 3 or 4
c. Microprocessor tray
5.
(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.
6.
(Trained service technicians only) If there is no indication of which
microprocessor has failed, isolate the error by testing with one microprocessor
at a time.
7. Replace the following components one at a time, in the order shown, restarting
the server each time.
a. (Trained service technician only) Microprocessor 1
b. Microprocessor VRM 3 or 4
c. (Trained service technician only) Microprocessor tray
8.
(Trained service technician only) If there are multiple microprocessor, light path,
or error codes that indicate a damaged microprocessor, switch two
microprocessors to see if the error moves with the microprocessor or if it stays
with the microprocessor socket.
Note: For sockets 3 and 4, if the error stays with the socket, switch the VRM3
and VRM4.
v If the error moved with the microprocessor, replace the microprocessor.
v If the error moved with the VRM, replace the VRM.
v If the error stayed at the same socket, replace the microprocessor tray.
Monitor problems
Some IBM monitors have their own self-tests. If you suspect a problem with your
monitor, see the documentation that comes with the monitor for instructions for
testing and adjusting the monitor. If you cannot diagnose the problem, call for
service.
94 IBM System x3850 Type 8864: Problem Determination and Service Guide
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