IBM 72335LU - System x3850 M2 Installation Manual page 75

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.
Lit light path
diagnostics LED with
the system-error LED
also lit Description
CPU A microprocessor has failed, is
missing, or has been incorrectly
installed.
VRM A dc-dc regulator has failed or is
missing.
Action
1. Make sure that the microprocessors are installed in
the correct sequence; see "Installing an additional
microprocessor" on page 19.
2. Check the BMC log or the system-error log to
determine the reason for the lit LED.
3. Find the failing, missing, or mismatched
microprocessor by checking the LEDs on the
microprocessor board.
4. Reseat the following components:
a. Failing microprocessor
b. Microprocessor board
5. 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
1. Check the BMC log or the system-error log to
determine the reason for the lit LED (for a VRM).
2. Find the failing or missing VRM by checking the
LEDs on the microprocessor board.
3. Install any missing VRMs.
4. Reseat the following components:
a. Failing VRM
b. Microprocessor associated with the VRM
c. Microprocessor board
5. Replace the following components one at a time,
in the order shown, restarting the server each time:
a. Failing VRM
b. (Trained service technician only)
Microprocessor associated with the VRM
c. (Trained service technician only)
Microprocessor board
Chapter 6. Solving problems
63