Replacing the system board, Replacing, System – Lenovo ThinkCentre M55 User Manual
Page 18: Board
Replacing
the
system
board
Attention:
Do
not
remove
the
computer
cover
or
attempt
any
repair
before
reading
the
“Important
safety
information”
in
the
Safety
and
warranty
guide
that
was
included
with
your
computer
or
in
the
Hardware
Maintenance
Manual
(HMM)
for
the
computer.
To
obtain
copies
of
the
Safety
and
warranty
guide
or
HMM,
go
to
the
Support
Web
site
at
http://www.lenovo.com/
think/support.
Note:
The
system
board
in
your
computer
might
look
different
than
those
shown
in
the
following
illustrations.
1.
Turn
off
the
computer
and
allow
it
to
cool
for
one
hour.
2.
Remove
the
computer
cover
and
the
hard
disk
drive
mounting
bracket.
See
3.
To
access
the
system
board,
lay
the
computer
on
its
side.
4.
Remove
the
air
baffle
by
squeezing
the
two
tabs
1
together
and
pulling
it
out
of
the
chassis.
10
Hardware
Replacement
Guide