IBM 621858U Installation Guide - Page 61

Power, problems

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Power problems 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)," that step must be performed only by a trained service technician. Symptom Action The power-control button does not work, and the reset button, if supported, does work. 1. (Trained service technician only) Reseat the power switch/LED assembly cable. 2. Replace the following components one at a time, in the order shown, restarting the computer each time: a. (Trained service technician only) Power switch/LED assembly b. (Trained service technician only) System board The computer does not start. 1. Make sure that: v The power cords are correctly connected to the computer and to a working electrical outlet. v The type of memory that is installed is correct. 2. If you just installed an optional device, remove it, and restart the computer. If the computer now starts, you might have installed more devices than the power supply supports. 3. Override the front panel power control button: a. Disconnect the computer power cords. b. Reconnect the power cords. (Trained service technician only) If the computer does not start, replace the system board. 4. See "Solving Undetermined Problems" in the Problem Determination and Service Guide. The computer does not turn off. 1. Determine whether you are using an Advanced Configuration and Power Interface (ACPI) or non-ACPI operating system. If you are using a non-ACPI operating system, complete the following steps: a. Press Ctrl+Alt+Delete b. Turn off the computer by pressing the power-control button for four seconds. c. If the computer fails POST and the power-control button does not work, disconnect the power cord. 2. If the problem remains or if you are using an ACPI-aware operating system, the problem could be with the system board. Chapter 5. Solving problems 49

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Power
problems
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),”
that
step
must
be
performed
only
by
a
trained
service
technician.
Symptom
Action
The
power-control
button
does
not
work,
and
the
reset
button,
if
supported,
does
work.
1.
(Trained
service
technician
only)
Reseat
the
power
switch/LED
assembly
cable.
2.
Replace
the
following
components
one
at
a
time,
in
the
order
shown,
restarting
the
computer
each
time:
a.
(Trained
service
technician
only)
Power
switch/LED
assembly
b.
(Trained
service
technician
only)
System
board
The
computer
does
not
start.
1.
Make
sure
that:
v
The
power
cords
are
correctly
connected
to
the
computer
and
to
a
working
electrical
outlet.
v
The
type
of
memory
that
is
installed
is
correct.
2.
If
you
just
installed
an
optional
device,
remove
it,
and
restart
the
computer.
If
the
computer
now
starts,
you
might
have
installed
more
devices
than
the
power
supply
supports.
3.
Override
the
front
panel
power
control
button:
a.
Disconnect
the
computer
power
cords.
b.
Reconnect
the
power
cords.
(Trained
service
technician
only)
If
the
computer
does
not
start,
replace
the
system
board.
4.
See
“Solving
Undetermined
Problems”
in
the
Problem
Determination
and
Service
Guide
.
The
computer
does
not
turn
off.
1.
Determine
whether
you
are
using
an
Advanced
Configuration
and
Power
Interface
(ACPI)
or
non-ACPI
operating
system.
If
you
are
using
a
non-ACPI
operating
system,
complete
the
following
steps:
a.
Press
Ctrl+Alt+Delete
b.
Turn
off
the
computer
by
pressing
the
power-control
button
for
four
seconds.
c.
If
the
computer
fails
POST
and
the
power-control
button
does
not
work,
disconnect
the
power
cord.
2.
If
the
problem
remains
or
if
you
are
using
an
ACPI-aware
operating
system,
the
problem
could
be
with
the
system
board.
Chapter
5.
Solving
problems
49