IBM System x3400 Type 7973, Problem Determination And Service Manual

Page: 65 / 210

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 x3400 Types 7973, 7974, 7975 and 7976,” on page 87 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
A microprocessor LED is lit
during POST, indicating that the
startup (boot) microprocessor is
not working correctly.
1.
2. Make sure that the server supports all the microprocessors and that the
microprocessors match in speed and cache size.
3. Reseat the following components:
a. (Trained service technician only) Microprocessor
b. VRM
4. (Trained service technician only) If there is no indication of which
microprocessor has failed, isolate the error by testing with one microprocessor
at a time.
5. Replace the following components one at a time, in the order shown, restarting
the server each time:
a. (Trained service technician only) Microprocessor
b. (Trained service technician only) System board
6. (Trained service technician only) If there are multiple error codes or LEDs that
indicate a microprocessor error, reverse the locations of the microprocessors or
with a microprocessor socket.
Monitor or video 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.
Chapter 2. Diagnostics
47