IBM 8478 Hardware Maintenance Manual - Page 28

Recovering

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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 117). 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 117). Recovering BIOS If the BIOS has become corrupted, such as from a power failure during a flash update, you can recover the BIOS using the boot block jumper and a BIOS flash diskette. The boot block jumper selects which of two BIOS images to use. In the normal position, the jumper will be installed on pins 2 and 3. In the alternate block position, the jumper will be installed on pins 1 and 2. Note: 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 to make a BIOS flash diskette from the World Wide Web. Go to http://www.pc.ibm.com/support/ select IBM System Support, and then make the selections for your system. Do the following to recover the BIOS: 1. Turn off the server and peripheral devices and disconnect all external cables and power cords; then, remove the side cover, see "Removing the side cover" on page 46. 2. Locate jumper JROM1 on the system board. 18 Hardware Maintenance Manual: xSeries 200

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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
117).
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
117).
Recovering
BIOS
If
the
BIOS
has
become
corrupted,
such
as
from
a
power
failure
during
a
flash
update,
you
can
recover
the
BIOS
using
the
boot
block
jumper
and
a
BIOS
flash
diskette.
The
boot
block
jumper
selects
which
of
two
BIOS
images
to
use.
In
the
normal
position,
the
jumper
will
be
installed
on
pins
2
and
3.
In
the
alternate
block
position,
the
jumper
will
be
installed
on
pins
1
and
2.
Note:
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
to
make
a
BIOS
flash
diskette
from
the
World
Wide
Web.
Go
to
select
IBM
System
Support,
and
then
make
the
selections
for
your
system.
Do
the
following
to
recover
the
BIOS:
1.
Turn
off
the
server
and
peripheral
devices
and
disconnect
all
external
cables
and
power
cords;
then,
remove
the
side
cover,
see
“Removing
the
side
cover”
on
page
46.
2.
Locate
jumper
JROM1
on
the
system
board.
18
Hardware
Maintenance
Manual:
xSeries
200