IBM x3400 User Guide - Page 33

System-board, switches - bios update

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System-board switches The following illustration shows the SW4 switch (Boot block/Clear CMOS) on the system board. DIMM LEDs 6 12 5 11 4 10 39 28 17 SW4 (Boot block/Clear CMOS) The following table describes the function of each pin on the SW4 switch (Boot block/Clear CMOS) on the system board. Table 3. System board SW4 switch Switch pin number 1 Description Boot block: v When this switch is on 1, this is normal mode. v When this switch is toggled to On, this enables the system to recover if the BIOS code becomes damaged. See the Problem Determination and Service Guide for information about recovering from a BIOS update failure. 2 Clear CMOS: v When this switch is on 2, this is normal mode. This keeps the CMOS data. v When this switch is toggled to On, this clears the CMOS data, which clears the power-on password and administrator password. Chapter 2. Installing options 19

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System-board
switches
The
following
illustration
shows
the
SW4
switch
(Boot
block/Clear
CMOS)
on
the
system
board.
1
2
3
4
5
6
7
8
9
10
11
12
DIMM LEDs
SW4 (Boot block/Clear CMOS)
The
following
table
describes
the
function
of
each
pin
on
the
SW4
switch
(Boot
block/Clear
CMOS)
on
the
system
board.
Table
3.
System
board
SW4
switch
Switch
pin
number
Description
1
Boot
block:
v
When
this
switch
is
on
1
,
this
is
normal
mode.
v
When
this
switch
is
toggled
to
On
,
this
enables
the
system
to
recover
if
the
BIOS
code
becomes
damaged.
See
the
Problem
Determination
and
Service
Guide
for
information
about
recovering
from
a
BIOS
update
failure.
2
Clear
CMOS:
v
When
this
switch
is
on
2
,
this
is
normal
mode.
This
keeps
the
CMOS
data.
v
When
this
switch
is
toggled
to
On
,
this
clears
the
CMOS
data,
which
clears
the
power-on
password
and
administrator
password.
Chapter
2.
Installing
options
19