IBM 8872 Service Guide - Page 106

Solving, undetermined, problems

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Solving undetermined problems If the diagnostic tests did not diagnose the failure or if the server is inoperative, use the information in this section. If you suspect that a software problem is causing failures (continuous or intermittent), see "Software problems" on page 48. Damaged data in CMOS memory or damaged BIOS code can cause undetermined problems. To reset the CMOS data, use the password override jumper to override the power-on password and clear the CMOS memory; see "I/O board internal connectors and jumpers" on page 8. If you suspect that the BIOS code is damaged, see "Recovering from a BIOS update failure" on page 77. Check the LEDs on all the power supplies (see "Power-supply LEDs" on page 57). If the LEDs indicate that the power supplies are working correctly, complete the following steps: 1. Turn off the server. 2. Make sure that the server is cabled correctly. 3. Remove or disconnect the following devices, one at a time, until you find the failure. Turn on the server and reconfigure it each time. v Any external devices. v Surge-suppressor device (on the server). v Modem, printer, mouse, and non-IBM devices. v Each adapter. v Hard disk drives. v Memory modules. The minimum configuration requirement is 2 GB (two 1 GB DIMMs). v Service processor. The following minimum configuration is required for the server to turn on: v One microprocessor v Two 1 GB DIMMs on the memory card v One power supply v Power backplane v Power cord v I/O board v PCI-X board 4. Turn on the server. If the problem remains, suspect the following components in the following order: a. Power backplane b. I/O board c. Memory card d. Microprocessor tray If the problem is solved when you remove an adapter from the server but the problem recurs when you reinstall the same adapter, suspect the adapter; if the problem recurs when you replace the adapter with a different one, suspect the PCI-X board. If you suspect a networking problem and the server passes all the system tests, suspect a network cabling problem that is external to the server. 90 IBM xSeries 460 Type 8872 and xSeries MXE 460 Type 8874: Problem Determination and Service Guide

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Solving
undetermined
problems
If
the
diagnostic
tests
did
not
diagnose
the
failure
or
if
the
server
is
inoperative,
use
the
information
in
this
section.
If
you
suspect
that
a
software
problem
is
causing
failures
(continuous
or
intermittent),
see
“Software
problems”
on
page
48.
Damaged
data
in
CMOS
memory
or
damaged
BIOS
code
can
cause
undetermined
problems.
To
reset
the
CMOS
data,
use
the
password
override
jumper
to
override
the
power-on
password
and
clear
the
CMOS
memory;
see
“I/O
board
internal
connectors
and
jumpers”
on
page
8.
If
you
suspect
that
the
BIOS
code
is
damaged,
see
“Recovering
from
a
BIOS
update
failure”
on
page
77.
Check
the
LEDs
on
all
the
power
supplies
(see
“Power-supply
LEDs”
on
page
57).
If
the
LEDs
indicate
that
the
power
supplies
are
working
correctly,
complete
the
following
steps:
1.
Turn
off
the
server.
2.
Make
sure
that
the
server
is
cabled
correctly.
3.
Remove
or
disconnect
the
following
devices,
one
at
a
time,
until
you
find
the
failure.
Turn
on
the
server
and
reconfigure
it
each
time.
v
Any
external
devices.
v
Surge-suppressor
device
(on
the
server).
v
Modem,
printer,
mouse,
and
non-IBM
devices.
v
Each
adapter.
v
Hard
disk
drives.
v
Memory
modules.
The
minimum
configuration
requirement
is
2
GB
(two
1
GB
DIMMs).
v
Service
processor.
The
following
minimum
configuration
is
required
for
the
server
to
turn
on:
v
One
microprocessor
v
Two
1
GB
DIMMs
on
the
memory
card
v
One
power
supply
v
Power
backplane
v
Power
cord
v
I/O
board
v
PCI-X
board
4.
Turn
on
the
server.
If
the
problem
remains,
suspect
the
following
components
in
the
following
order:
a.
Power
backplane
b.
I/O
board
c.
Memory
card
d.
Microprocessor
tray
If
the
problem
is
solved
when
you
remove
an
adapter
from
the
server
but
the
problem
recurs
when
you
reinstall
the
same
adapter,
suspect
the
adapter;
if
the
problem
recurs
when
you
replace
the
adapter
with
a
different
one,
suspect
the
PCI-X
board.
If
you
suspect
a
networking
problem
and
the
server
passes
all
the
system
tests,
suspect
a
network
cabling
problem
that
is
external
to
the
server.
90
IBM
xSeries
460
Type
8872
and
xSeries
MXE
460
Type
8874:
Problem
Determination
and
Service
Guide