9.
Remove
the
four
screws
at
the
fan
sink
retention
module
for
microprocessor
one
and
set
them
in
a
safe
place.
10.
If
the
optional
microprocessor
board
had
not
been
installed,
remove
the
six
screws
at
the
location
where
it
would
be
installed
and
set
them
in
a
safe
place.
11.
Remove
the
remaining
screws
that
holding
the
system
board
to
the
chassis
and
set
them
in
a
safe
place.
12.
While
gently
pushing
in
on
the
rear
I/O
panel
from
outside
the
chassis,
slide
the
system
board
toward
the
front
of
the
chassis
until
the
rear
I/O
panel
is
free
of
the
chassis.
13.
Carefully
lift
the
system
board
and
extender
out
of
the
chassis.
Attention:
When
lifting
the
system
board
out
of
the
chassis,
make
sure
that
you
provide
support
to
the
main
system
board
and
the
extender
board.
Figure
43.
System
board
removal
Chapter
4.
Removing
and
replacing
computer
components
139
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