Lenovo Desktop PC Manuel D’Utilisation
Note:
Some
computer
parts
can
be
upgraded
or
replaced
by
the
customer.
Upgrades
typically
are
referred
to
as
options.
Replacement
parts
approved
for
customer
installation
are
referred
to
as
Customer
Replaceable
Units,
or
CRUs.
Lenovo
provides
documentation
with
instructions
when
it
is
appropriate
for
customers
to
install
options
or
replace
CRUs.
You
must
closely
follow
all
instructions
when
installing
or
replacing
parts.
The
Off
state
of
a
power
indicator
does
not
necessarily
mean
that
voltage
levels
inside
a
product
are
zero.
Before
you
remove
the
covers
from
a
product
equipped
with
an
ac
power
cord,
always
make
sure
that
the
power
is
turned
off
and
that
the
product
is
unplugged
from
any
power
source.
For
more
information
on
CRUs,
refer
to
the
User
Guide
for
this
product.
If
you
have
any
questions
or
concerns,
contact
the
Customer
Support
Center.
Although
there
are
no
moving
parts
in
your
computer
after
the
power
cord
has
been
disconnected,
the
following
warnings
are
required
for
your
safety.
Danger
Hazardous
moving
parts.
Keep
fingers
and
other
body
parts
away.
Attention
Before
replacing
any
CRUs,
turn
off
the
computer
and
wait
three
to
five
minutes
to
let
the
computer
cool
before
opening
the
cover.
Static
electricity
prevention
Static
electricity,
although
harmless
to
you,
can
seriously
damage
computer
components
and
options.
Improper
handling
of
static-sensitive
parts
can
cause
damage
to
the
part.
When
you
unpack
an
option
or
CRU,
do
not
open
the
static-protective
package
containing
the
part
until
the
instructions
direct
you
to
install
it.
Chapter
1.
Important
safety
information
3