<s>
The	O
iMac	B-Device
G5	I-Device
is	O
an	O
all-in-one	B-Device
personal	B-Device
computer	I-Device
that	O
was	O
designed	O
,	O
manufactured	O
and	O
sold	O
by	O
Apple	O
Computer	O
from	O
August	O
2004	O
to	O
March	O
2006	O
.	O
</s>
<s>
It	O
is	O
the	O
final	O
iMac	B-Device
to	O
use	O
a	O
PowerPC	B-Architecture
processor	I-Architecture
,	O
making	O
it	O
the	O
last	O
model	O
that	O
could	O
natively	O
run	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
(	O
Classic	O
)	O
applications	O
.	O
</s>
<s>
It	O
was	O
replaced	O
in	O
January	O
2006	O
by	O
the	O
Intel-based	B-Device
iMac	I-Device
,	O
which	O
retained	O
the	O
features	O
,	O
price	O
,	O
and	O
case	O
design	O
of	O
the	O
iMac	B-Device
G5	I-Device
.	O
</s>
<s>
In	O
August	O
2004	O
,	O
the	O
iMac	B-Device
design	O
was	O
overhauled	O
.	O
</s>
<s>
By	O
this	O
time	O
,	O
the	O
PowerPC	B-General_Concept
970	I-General_Concept
(	O
G5	B-Device
)	O
processor	B-General_Concept
had	O
been	O
released	O
and	O
was	O
being	O
used	O
in	O
the	O
Power	B-Device
Mac	I-Device
G5	I-Device
.	O
</s>
<s>
Famously	O
,	O
the	O
Power	B-Device
Mac	I-Device
G5	I-Device
needed	O
multiple	O
fans	O
in	O
a	O
large	O
casing	O
(	O
or	O
else	O
liquid	O
cooling	O
,	O
an	O
innovative	O
solution	O
Apple	O
adopted	O
for	O
the	O
highest-end	O
Power	B-Device
Mac	I-Device
G5s	I-Device
)	O
because	O
of	O
the	O
high	O
heat	O
output	O
from	O
those	O
CPUs	O
.	O
</s>
<s>
Apple	O
's	O
new	O
iMac	B-Device
managed	O
to	O
incorporate	O
the	O
PowerPC	B-General_Concept
970	I-General_Concept
into	O
an	O
all-in-one	B-Device
design	O
with	O
a	O
distinctive	O
form	O
factor	O
.	O
</s>
<s>
The	O
computer	O
used	O
the	O
same	O
17	O
and	O
20-inch	O
widescreen	O
LCDs	O
found	O
in	O
the	O
iMac	B-Device
G4	I-Device
,	O
with	O
the	O
main	O
logic	O
board	O
and	O
optical	O
drive	O
now	O
mounted	O
directly	O
behind	O
the	O
LCD	O
panel	O
;	O
this	O
gave	O
the	O
appearance	O
of	O
a	O
thickened	O
desktop	O
LCD	O
monitor	O
.	O
</s>
<s>
The	O
iMac	B-Device
G5	I-Device
uses	O
an	O
advanced	O
cooling	O
system	O
controlled	O
by	O
the	O
operating	O
system	O
;	O
at	O
low	O
CPU	O
loads	O
this	O
rendered	O
the	O
iMac	B-Device
G5	I-Device
virtually	O
silent	O
.	O
</s>
<s>
The	O
iMac	B-Device
G5	I-Device
was	O
updated	O
in	O
March	O
2005	O
to	O
the	O
Ambient	O
Light	O
Sensor	O
(	O
ALS	O
)	O
revision	O
.	O
</s>
<s>
It	O
included	O
a	O
handful	O
of	O
configuration	O
differences	O
–	O
more	O
RAM	B-Architecture
,	O
a	O
larger	O
hard	B-Device
drive	I-Device
,	O
improved	O
graphics	O
,	O
Gigabit	O
Ethernet	O
,	O
and	O
standard	O
AirPort	O
Extreme	O
(	O
802.11g	O
)	O
and	O
Bluetooth	B-Protocol
2.0	I-Protocol
+EDR	I-Protocol
.	O
</s>
<s>
In	O
October	O
2005	O
,	O
the	O
final	O
revision	O
was	O
released	O
,	O
adding	O
an	O
integrated	O
iSight	B-Protocol
webcam	O
mounted	O
above	O
the	O
LCD	O
and	O
Apple	O
's	O
Front	B-Operating_System
Row	I-Operating_System
media	O
interface	O
.	O
</s>
<s>
Other	O
improvements	O
included	O
faster	O
processors	O
,	O
more	O
RAM	B-Architecture
,	O
larger	O
hard	B-Device
drives	I-Device
,	O
and	O
improved	O
graphics	O
.	O
</s>
<s>
Notably	O
this	O
became	O
the	O
first	O
Apple	O
computer	O
to	O
use	O
the	O
PCI	O
Express	O
expansion	O
bus	O
and	O
DDR2	O
SDRAM	O
,	O
with	O
these	O
features	O
appearing	O
shortly	O
before	O
they	O
were	O
incorporated	O
into	O
the	O
Power	B-Device
Mac	I-Device
G5	I-Device
.	O
</s>
<s>
It	O
was	O
declared	O
"	O
The	O
Gold	O
Standard	O
of	O
desktop	O
PCs	B-Device
"	O
by	O
Walt	O
Mossberg	O
of	O
The	O
Wall	O
Street	O
Journal	O
.	O
</s>
<s>
Although	O
the	O
iMac	B-Device
G5	I-Device
iSight	I-Device
looked	O
outwardly	O
similar	O
to	O
the	O
two	O
previous	O
revisions	O
,	O
it	O
had	O
a	O
slimmer	O
,	O
internally	O
new	O
design	O
.	O
</s>
<s>
Apple	O
recommend	O
no	O
user	O
serviceable	O
items	O
other	O
than	O
RAM	B-Architecture
,	O
which	O
is	O
accessible	O
through	O
a	O
small	O
door	O
at	O
the	O
base	O
of	O
the	O
housing	O
.	O
</s>
<s>
In	O
the	O
intervening	O
years	O
,	O
many	O
guides	O
have	O
been	O
posted	O
on	O
the	O
internet	O
to	O
support	O
replacing	O
other	O
components	O
including	O
the	O
hard	B-Device
drive	I-Device
and	O
optical	O
drive	O
,	O
though	O
doing	O
would	O
have	O
at	O
one	O
time	O
voided	O
any	O
remaining	O
Apple	O
warranty	O
.	O
</s>
<s>
The	O
iMac	B-Device
G5	I-Device
was	O
succeeded	O
by	O
the	O
Intel-based	B-Device
iMac	I-Device
on	O
January	O
10	O
,	O
2006	O
,	O
beginning	O
the	O
6-month	O
transition	O
of	O
Apple	O
's	O
entire	O
line	O
of	O
computers	O
to	O
the	O
Intel	O
architecture	O
.	O
</s>
