IBM 8863 Service Guide - Page 107

Solving, undetermined, problems

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Solving undetermined problems Use the information in this section if the diagnostic tests did not diagnose the failure or if the server is inoperative. If you suspect that a software problem is causing failures (continuous or intermittent), see "Software problems" on page 47. 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 76. Damaged memory card connector pins or improperly installed memory cards can prevent the server from starting or might cause a POST checkpoint halt. For example, a memory card that is not completely installed or has bent connector pins might cause the server to continually restart or display an F2 checkpoint halt. Remove and inspect all memory card connector pins for bent or damaged interface pins. Replace all memory cards that have damaged pins and ensure that the card is completely latched into place. Check the LEDs on all the power supplies (see "Power-supply LEDs" on page 55). 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 Chapter 2. Diagnostics 91

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Solving
undetermined
problems
Use
the
information
in
this
section
if
the
diagnostic
tests
did
not
diagnose
the
failure
or
if
the
server
is
inoperative.
If
you
suspect
that
a
software
problem
is
causing
failures
(continuous
or
intermittent),
see
“Software
problems”
on
page
47.
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
76.
Damaged
memory
card
connector
pins
or
improperly
installed
memory
cards
can
prevent
the
server
from
starting
or
might
cause
a
POST
checkpoint
halt.
For
example,
a
memory
card
that
is
not
completely
installed
or
has
bent
connector
pins
might
cause
the
server
to
continually
restart
or
display
an
F2
checkpoint
halt.
Remove
and
inspect
all
memory
card
connector
pins
for
bent
or
damaged
interface
pins.
Replace
all
memory
cards
that
have
damaged
pins
and
ensure
that
the
card
is
completely
latched
into
place.
Check
the
LEDs
on
all
the
power
supplies
(see
“Power-supply
LEDs”
on
page
55).
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
Chapter
2.
Diagnostics
91