IBM 8479 Hardware Maintenance Manual - Page 22

Power, checkout, Recovering - bios download

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messages appear that are not listed in those tables, make sure that the server has the latest levels of BIOS, Advanced System Management Processor, ServeRAID, and diagnostics microcode installed. Power checkout Power problems can be difficult to troubleshoot. For instance, a short circuit can exist anywhere on any of the power distribution busses. 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. Power off the server and disconnect the AC cord(s). 2. Check for loose cables in the power subsystem. Also check for short circuits, for instance 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 server is at minimum configuration required for power on (see ″Minimum operating requirements″ on page 97). 4. Reconnect the AC cord and power on the server. If the server powers up successfully, replace adapters and devices one at a time until the problem is isolated. If server does not power up from 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 server to power up (see page 97). Recovering BIOS If the BIOS code has become damaged, such as from a power failure during a flash update, you can recover the BIOS code using a BIOS flash diskette. You can obtain a BIOS flash diskette from one of the following sources: v Use the ServerGuide program to make a BIOS flash diskette. v Download files from the World Wide Web to make a BIOS flash diskette. Go to http://www.ibm.com/pc/support/ select IBM System Support, and then make the selections for your system. Complete the following steps to recover the BIOS code: 1. When prompted, insert the BIOS flash diskette into the diskette drive. 2. Restart the server. The BIOS begins the power-on self-test. 3. The BIOS flash utility automatically starts. 4. When prompted as to whether you want to save the current code to a diskette, select N. 5. When prompted, press Y to continue the flash process. 6. The system automatically starts the flash utility a second time. 7. When prompted as to whether you want to save the current BIOS code, stop the process by removing the BIOS flash diskette from the diskette drive. 8. Restart the server, which should start up normally. 14 xSeries 200 Type 8479 and xSeries 200VL Type 8481: Hardware Maintenance Manual

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messages
appear
that
are
not
listed
in
those
tables,
make
sure
that
the
server
has
the
latest
levels
of
BIOS,
Advanced
System
Management
Processor,
ServeRAID,
and
diagnostics
microcode
installed.
Power
checkout
Power
problems
can
be
difficult
to
troubleshoot.
For
instance,
a
short
circuit
can
exist
anywhere
on
any
of
the
power
distribution
busses.
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.
Power
off
the
server
and
disconnect
the
AC
cord(s).
2.
Check
for
loose
cables
in
the
power
subsystem.
Also
check
for
short
circuits,
for
instance
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
server
is
at
minimum
configuration
required
for
power
on
(see
″
Minimum
operating
requirements
″
on
page
97).
4.
Reconnect
the
AC
cord
and
power
on
the
server.
If
the
server
powers
up
successfully,
replace
adapters
and
devices
one
at
a
time
until
the
problem
is
isolated.
If
server
does
not
power
up
from
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
server
to
power
up
(see
page
97).
Recovering
BIOS
If
the
BIOS
code
has
become
damaged,
such
as
from
a
power
failure
during
a
flash
update,
you
can
recover
the
BIOS
code
using
a
BIOS
flash
diskette.
You
can
obtain
a
BIOS
flash
diskette
from
one
of
the
following
sources:
v
Use
the
ServerGuide
program
to
make
a
BIOS
flash
diskette.
v
Download
files
from
the
World
Wide
Web
to
make
a
BIOS
flash
diskette.
Go
to
select
IBM
System
Support,
and
then
make
the
selections
for
your
system.
Complete
the
following
steps
to
recover
the
BIOS
code:
1.
When
prompted,
insert
the
BIOS
flash
diskette
into
the
diskette
drive.
2.
Restart
the
server.
The
BIOS
begins
the
power-on
self-test.
3.
The
BIOS
flash
utility
automatically
starts.
4.
When
prompted
as
to
whether
you
want
to
save
the
current
code
to
a
diskette,
select
N.
5.
When
prompted,
press
Y
to
continue
the
flash
process.
6.
The
system
automatically
starts
the
flash
utility
a
second
time.
7.
When
prompted
as
to
whether
you
want
to
save
the
current
BIOS
code,
stop
the
process
by
removing
the
BIOS
flash
diskette
from
the
diskette
drive.
8.
Restart
the
server,
which
should
start
up
normally.
14
xSeries
200
Type
8479
and
xSeries
200VL
Type
8481:
Hardware
Maintenance
Manual