Undetermined
problems
Use
the
information
in
this
section
if
the
diagnostic
tests
did
not
identify
the
failure,
the
devices
list
is
incorrect,
or
the
system
is
inoperative.
Damaged
data
in
CMOS
memory
or
damaged
BIOS
code
can
cause
undetermined
problems.
To
reset
the
CMOS
data,
use
the
password
override
switch
to
override
the
power-on
password
and
clear
the
CMOS
memory;
see
“Erasing
a
lost
or
forgotten
password
(clearing
CMOS
memory)”
on
page
99.
If
you
suspect
that
the
BIOS
code
is
damaged,
see
“Recovering
the
BIOS
code”
on
page
97.
Check
the
LEDs
on
all
the
power
supplies
(see
“Power-supply
LEDs”
on
page
95).
If
the
LEDs
indicate
the
power
supplies
are
working
correctly,
complete
the
following
steps:
1.
Turn
off
the
server.
2.
Be
sure
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
each
time):
v
Any
external
devices
v
Surge
suppressor
device
(on
the
server)
v
Modem,
printer,
mouse,
or
non-IBM
devices
v
Each
adapter
v
Drives
v
Memory
modules
(minimum
requirement
=
two
256
MB
DIMMs)
Note:
Minimum
operating
requirements
are:
a.
One
power
supply
b.
System
board
with
functioning
integrated
VRD
c.
One
microprocessor
d.
Memory
module
(with
a
minimum
of
two
256
MB
DIMMs)
4.
Turn
on
the
server.
If
the
problem
remains,
suspect
the
following
FRUs
in
the
order
listed:
v
Power
supply
v
System
board
Notes:
1.
If
the
problem
goes
away
when
you
remove
an
adapter
from
the
system
and
replacing
that
adapter
does
not
correct
the
problem,
suspect
the
system
board.
2.
If
you
suspect
a
networking
problem
and
all
the
system
tests
pass,
suspect
a
network
cabling
problem
external
to
the
system.
140
xSeries
236
Type
8841:
Hardware
Maintenance
Manual
and
Troubleshooting
Guide
Summary of Contents for 884155U
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