21.
Reconnect
the
heat
sink
and
fan
assembly
cable
to
the
system
board.
See
the
system
board
illustration
for
your
machine
type
at
“Locating
parts
on
the
system
board”
on
page
87.
22.
Install
the
new
system
board
into
the
chassis
and
align
the
screw
holes
with
those
in
the
chassis.
Insert
and
tighten
the
screws
that
secure
the
system
board.
23.
Reconnect
all
cables
that
were
disconnected
from
the
system
board.
24.
Reinstall
the
hard
disk
drive.
See
“Replacing
the
hard
disk
drive”
on
page
112.
25.
Align
the
drive
bay
assembly
with
the
two
slots
and
rails
on
the
sides
of
the
chassis,
reconnect
the
drive
cables
on
the
system
board,
and
then
slide
the
drive
bay
assembly
towards
the
rear
of
the
chassis
until
it
snaps
into
position.
26.
Reinstall
the
front
bezel.
27.
Reinstall
any
PCI
adapter
cards
that
were
removed.
28.
Position
the
fan
duct
on
the
heat
sink
fan.
29.
Go
to
“Completing
the
FRU
replacement”
on
page
120.
Chapter
8.
Replacing
FRUs
-
Desktop
computers
103
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