IBM 8480 Hardware Maintenance Manual - Page 39

Recovering, POST/BIOS, update, failure, Power, checkout - bios update

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Recovering from a POST/BIOS update failure If power to your server is interrupted while POST/BIOS is being updated (flash update), your server might not restart correctly. If this happens, perform the following procedure: 1. Turn off the server and all attached devices. 2. Unplug all power cords from electrical outlets and remove the server cover and the support bracket. See the Option Installation Guide for instructions. 3. Locate the boot block and password check jumpers on the system board, removing any adapters that impede access to the jumpers. See "System and PCI extender boards" on page 34 for the location of the boot block and password check jumpers. 4. Move both jumpers to the adjacent pair of jumper pins. 5. Replace any adapters that were removed and replace the support bracket and the cover. See the Option Installation Guide for instructions. Reconnect the power cords for the server and monitor to electrical outlets. 6. Insert the POST/BIOS update (flash) diskette into drive A, and turn on the server and monitor. 7. After the update session completes, remove the diskette from the diskette drive, and turn off the server and monitor. 8. Unplug all power cords from electrical outlets, and remove the cover. 9. Remove any adapters that impede access to the boot block and password check jumpers. 10. Replace the boot block and password check jumpers to their original positions. 11. Replace any adapters that were removed. 12. Replace the cover, and reconnect all cables that were disconnected. 13. Turn on the server to restart the operating system. Power checkout Power problems can be difficult to solve. For example, a short circuit can exist anywhere on any of the power distribution buses. Usually a short circuit will cause the power subsystem to shut down because of an overcurrent condition. A general procedure for troubleshooting power problems is as follows: 1. Turn off the server and disconnect all ac power cords. 2. Check for loose cables in the power subsystem. Also check for short circuits, for example, if there is a loose screw causing a short circuit on a circuit board. 3. Remove adapters and disconnect the cables and power connectors to all internal and external devices until the server is at the minimum configuration required to start the server (see "Minimum operating requirements" on page 96). 4. Reconnect all ac power cords and turn on the server. If the server starts up successfully, replace adapters and devices one at a time until the problem is isolated. If the server does not start up from the minimal configuration, replace FRUs of minimal configuration one at a time until the problem is isolated. To use this method, it is important to know the minimum configuration required for a system to start (see page 96). Chapter 3. Diagnostics 29

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Recovering
from
a
POST/BIOS
update
failure
If
power
to
your
server
is
interrupted
while
POST/BIOS
is
being
updated
(flash
update),
your
server
might
not
restart
correctly.
If
this
happens,
perform
the
following
procedure:
1.
Turn
off
the
server
and
all
attached
devices.
2.
Unplug
all
power
cords
from
electrical
outlets
and
remove
the
server
cover
and
the
support
bracket.
See
the
Option
Installation
Guide
for
instructions.
3.
Locate
the
boot
block
and
password
check
jumpers
on
the
system
board,
removing
any
adapters
that
impede
access
to
the
jumpers.
See
“System
and
PCI
extender
boards”
on
page
34
for
the
location
of
the
boot
block
and
password
check
jumpers.
4.
Move
both
jumpers
to
the
adjacent
pair
of
jumper
pins.
5.
Replace
any
adapters
that
were
removed
and
replace
the
support
bracket
and
the
cover.
See
the
Option
Installation
Guide
for
instructions.
Reconnect
the
power
cords
for
the
server
and
monitor
to
electrical
outlets.
6.
Insert
the
POST/BIOS
update
(flash)
diskette
into
drive
A,
and
turn
on
the
server
and
monitor.
7.
After
the
update
session
completes,
remove
the
diskette
from
the
diskette
drive,
and
turn
off
the
server
and
monitor.
8.
Unplug
all
power
cords
from
electrical
outlets,
and
remove
the
cover.
9.
Remove
any
adapters
that
impede
access
to
the
boot
block
and
password
check
jumpers.
10.
Replace
the
boot
block
and
password
check
jumpers
to
their
original
positions.
11.
Replace
any
adapters
that
were
removed.
12.
Replace
the
cover,
and
reconnect
all
cables
that
were
disconnected.
13.
Turn
on
the
server
to
restart
the
operating
system.
Power
checkout
Power
problems
can
be
difficult
to
solve.
For
example,
a
short
circuit
can
exist
anywhere
on
any
of
the
power
distribution
buses.
Usually
a
short
circuit
will
cause
the
power
subsystem
to
shut
down
because
of
an
overcurrent
condition.
A
general
procedure
for
troubleshooting
power
problems
is
as
follows:
1.
Turn
off
the
server
and
disconnect
all
ac
power
cords.
2.
Check
for
loose
cables
in
the
power
subsystem.
Also
check
for
short
circuits,
for
example,
if
there
is
a
loose
screw
causing
a
short
circuit
on
a
circuit
board.
3.
Remove
adapters
and
disconnect
the
cables
and
power
connectors
to
all
internal
and
external
devices
until
the
server
is
at
the
minimum
configuration
required
to
start
the
server
(see
“Minimum
operating
requirements”
on
page
96).
4.
Reconnect
all
ac
power
cords
and
turn
on
the
server.
If
the
server
starts
up
successfully,
replace
adapters
and
devices
one
at
a
time
until
the
problem
is
isolated.
If
the
server
does
not
start
up
from
the
minimal
configuration,
replace
FRUs
of
minimal
configuration
one
at
a
time
until
the
problem
is
isolated.
To
use
this
method,
it
is
important
to
know
the
minimum
configuration
required
for
a
system
to
start
(see
page
96).
Chapter
3.
Diagnostics
29