IBM X3950 X5 Problem Determination And Service Manual page 83

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 4, "Parts listing, Types 7145, 7146, 7143, and 7191," on page 81 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.
Light path
diagnostics LED Description
CPU A microprocessor has failed, is
missing, or has been incorrectly
installed.
VRM Reserved
Action
1. If the CNFG light is lit, make sure that the
microprocessors are installed in the correct
sequence; see "Microprocessor" on page 160 and
make sure the microprocessors match each other
(speed and cache). Also make sure that the
microprocessors are supported by your server
machine type or multi-node configuration.
2. Check the system-event log to determine the
reason for the lit LED (see "Event logs" on page
38).
3. If PCI Express adapters are installed in slots 1, 2, 3,
or 4, make sure that the microprocessors are
correctly installed in sockets 3 and 4. If the server
is configured for only two microprocessors, make
sure that the second microprocessor is installed in
socket 3 or 4 (see the Installation and User's Guide
for additional information). The CONFIG LED is
also lit.
4. Find the failing, missing, or mismatched
microprocessor by checking the LEDs on the
microprocessor board.
5. Reseat the following components:
a. (Trained service technician only) Failing
microprocessor (see "Microprocessor" on page
160)
b. (Trained service technician only)
Microprocessor board (see "Removing the
microprocessor-board assembly" on page 171
and "Replacing the microprocessor-board
assembly" on page 173)
6. Replace the following components one at a time, in
the order shown, restarting the server each time:
a. (Trained service technician only) Failing
microprocessor
b. (Trained service technician only)
Microprocessor board
67
Chapter 3. Diagnostics