<s>
The	O
PowerBook	B-Operating_System
G4	I-Operating_System
is	O
a	O
series	O
of	O
notebook	B-Device
computers	I-Device
manufactured	O
,	O
marketed	O
,	O
and	O
sold	O
by	O
Apple	O
Computer	O
between	O
2001	O
and	O
2006	O
as	O
part	O
of	O
its	O
PowerBook	B-Device
line	O
of	O
notebooks	B-Device
.	O
</s>
<s>
The	O
PowerBook	B-Operating_System
G4	I-Operating_System
runs	O
on	O
the	O
RISC-based	B-Architecture
PowerPC	B-General_Concept
G4	I-General_Concept
processor	B-General_Concept
,	O
designed	O
by	O
the	O
AIM	O
(	O
Apple/IBM/Motorola	O
)	O
development	O
alliance	O
and	O
initially	O
produced	O
by	O
Motorola	O
.	O
</s>
<s>
The	O
PowerBook	B-Operating_System
G4	I-Operating_System
has	O
two	O
different	O
designs	O
:	O
one	O
enclosed	O
in	O
a	O
titanium	O
body	O
with	O
a	O
translucent	O
black	O
keyboard	O
and	O
a	O
15-inch	O
screen	O
;	O
and	O
another	O
in	O
an	O
aluminum	O
body	O
with	O
an	O
aluminum-colored	O
keyboard	O
,	O
in	O
12-inch	O
,	O
15-inch	O
,	O
and	O
17-inch	O
sizes	O
.	O
</s>
<s>
Between	O
2001	O
and	O
2003	O
,	O
Apple	O
produced	O
the	O
titanium	O
PowerBook	B-Operating_System
G4	I-Operating_System
;	O
between	O
2003	O
and	O
2006	O
,	O
the	O
aluminum	O
models	O
were	O
produced	O
.	O
</s>
<s>
When	O
the	O
aluminum	O
PowerBook	B-Operating_System
G4s	I-Operating_System
were	O
first	O
released	O
in	O
January	O
2003	O
,	O
12-inch	O
and	O
17-inch	O
models	O
were	O
introduced	O
first	O
,	O
while	O
the	O
15-inch	O
model	O
retained	O
the	O
titanium	O
body	O
until	O
September	O
2003	O
,	O
when	O
a	O
new	O
aluminum	O
15-inch	O
PowerBook	B-Device
was	O
released	O
.	O
</s>
<s>
The	O
aluminum	O
15-inch	O
model	O
also	O
includes	O
a	O
FireWire	B-Protocol
800	O
port	O
,	O
which	O
had	O
been	O
included	O
with	O
the	O
17-inch	O
model	O
since	O
its	O
debut	O
nine	O
months	O
earlier	O
.	O
</s>
<s>
The	O
PowerBook	B-Operating_System
G4	I-Operating_System
is	O
the	O
last	O
generation	O
of	O
the	O
PowerBook	B-Device
series	O
,	O
and	O
was	O
succeeded	O
by	O
the	O
Intel-powered	O
MacBook	B-Device
Pro	I-Device
line	O
in	O
the	O
first	O
half	O
of	O
2006	O
.	O
</s>
<s>
The	O
latest	O
version	O
of	O
OS	B-Operating_System
X	I-Operating_System
that	O
any	O
PowerBook	B-Operating_System
G4	I-Operating_System
can	O
run	O
is	O
Mac	B-Application
OS	I-Application
X	I-Application
Leopard	I-Application
,	O
released	O
in	O
2007	O
.	O
</s>
<s>
When	O
Apple	B-Device
switched	I-Device
to	I-Device
Intel	I-Device
x86	I-Device
processors	I-Device
in	I-Device
2006	I-Device
,	O
the	O
PowerBook	B-Operating_System
G4	I-Operating_System
's	O
form	O
and	O
aluminum	O
chassis	O
were	O
retained	O
for	O
the	O
MacBook	B-Device
Pro	I-Device
.	O
</s>
<s>
The	O
first	O
generation	O
of	O
the	O
PowerBook	B-Operating_System
G4	I-Operating_System
was	O
announced	O
at	O
Steve	O
Jobs	O
 '	O
MacWorld	O
Expo	O
keynote	B-Protocol
on	O
January	O
9	O
,	O
2001	O
.	O
</s>
<s>
The	O
two	O
models	O
featured	O
a	O
PowerPC	B-General_Concept
G4	I-General_Concept
processor	B-General_Concept
running	O
at	O
either	O
400	O
or	O
500	O
MHz	O
,	O
housed	O
in	O
a	O
titanium-clad	O
case	O
that	O
was	O
1	O
inch	O
(	O
25mm	O
)	O
deep	O
.	O
</s>
<s>
This	O
was	O
0.7inches	O
(	O
18mm	O
)	O
shallower	O
than	O
the	O
G4	O
's	O
predecessor	O
,	O
the	O
PowerBook	B-Device
G3	I-Device
.	O
</s>
<s>
The	O
G4	O
was	O
among	O
the	O
first	O
laptops	B-Device
to	O
use	O
a	O
screen	O
with	O
a	O
widescreen	O
aspect	B-General_Concept
ratio	I-General_Concept
.	O
</s>
<s>
The	O
notebook	B-Device
was	O
given	O
the	O
unofficial	O
nickname	O
"	O
TiBook	B-Operating_System
"	O
,	O
after	O
the	O
titanium	O
case	O
and	O
the	O
PowerBook	B-Device
brand	O
name	O
;	O
it	O
was	O
sold	O
alongside	O
the	O
cheaper	O
iBook	B-Device
.	O
</s>
<s>
The	O
1GHz	O
version	O
of	O
the	O
titanium	O
G4	O
is	O
the	O
last	O
,	O
and	O
fastest	O
,	O
PowerBook	B-Device
that	O
can	O
natively	O
run	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
(	O
version	O
9.2.2	O
)	O
.	O
</s>
<s>
The	O
initial	O
design	O
of	O
the	O
PowerBook	B-Operating_System
G4	I-Operating_System
was	O
developed	O
by	O
Apple	O
hardware	O
designers	O
Jory	O
Bell	O
,	O
Nick	O
Merz	O
,	O
and	O
Danny	O
Delulis	O
.	O
</s>
<s>
The	O
new	O
machine	O
was	O
a	O
sharp	O
departure	O
from	O
the	O
black	O
plastic	O
,	O
curvilinear	O
PowerBook	B-Device
G3	I-Device
models	O
that	O
preceded	O
it	O
.	O
</s>
<s>
PowerBook	B-Device
G3	I-Device
and	O
prior	O
models	O
presented	O
it	O
right-side-up	O
from	O
the	O
perspective	O
of	O
the	O
computer	O
's	O
owner	O
when	O
the	O
lid	O
was	O
closed	O
.	O
</s>
<s>
Apple	O
's	O
industrial	O
design	O
team	O
,	O
headed	O
by	O
British	O
designer	O
Jonathan	O
Ive	O
,	O
converged	O
around	O
a	O
minimalist	O
aesthetic	O
—	O
the	O
titanium	O
G4	O
's	O
design	O
language	O
laid	O
the	O
groundwork	O
for	O
the	O
aluminum	O
PowerBook	B-Operating_System
G4	I-Operating_System
,	O
the	O
MacBook	B-Device
Pro	I-Device
,	O
the	O
Power	B-Device
Mac	I-Device
G5	I-Device
,	O
the	O
flat-screen	O
iMac	B-Device
,	O
the	O
Xserve	B-Device
,	O
and	O
the	O
Mac	B-Device
mini	I-Device
.	O
</s>
<s>
The	O
hinges	O
on	O
the	O
titanium	O
PowerBook	B-Device
display	B-Device
are	O
notorious	O
for	O
breaking	O
under	O
typical	O
use	O
.	O
</s>
<s>
When	O
the	O
667MHz	O
and	O
800MHz	O
"	O
DVI	B-Protocol
"	O
PowerBooks	B-Device
were	O
introduced	O
,	O
Apple	O
changed	O
the	O
hinge	O
design	O
slightly	O
to	O
strengthen	O
it	O
.	O
</s>
<s>
At	O
least	O
one	O
aftermarket	O
manufacturer	O
began	O
producing	O
sturdier	O
replacement	O
hinges	O
to	O
address	O
this	O
problem	O
,	O
though	O
actually	O
performing	O
the	O
repair	O
is	O
difficult	O
as	O
the	O
display	B-Device
bezel	O
is	O
glued	O
together	O
.	O
</s>
<s>
This	O
appeared	O
on	O
early	O
models	O
but	O
not	O
on	O
later	O
titanium	O
PowerBooks	B-Device
.	O
</s>
<s>
Many	O
owners	O
have	O
reported	O
display	B-Device
problems	O
such	O
as	O
random	O
lines	O
or	O
a	O
jumbled	O
screen	O
,	O
although	O
a	O
few	O
owners	O
have	O
replaced	O
just	O
the	O
video	O
cable	O
to	O
successfully	O
resolve	O
this	O
problem	O
.	O
</s>
<s>
Model	O
"	O
Mercury	O
"	O
,	O
Original	O
TiBook	B-Operating_System
;	O
"	O
Onyx	O
"	O
,	O
Gigabit	O
TiBook	B-Operating_System
"	O
Ivory	O
"	O
,	O
DVI	B-Protocol
TiBook	B-Operating_System
"	O
Antimony	O
"	O
,	O
TiBook	B-Operating_System
Timetable	O
Released	O
January	O
9	O
,	O
2001	O
October	O
16	O
,	O
2001	O
April	O
29	O
,	O
2002	O
November	O
6	O
,	O
2002	O
Discontinued	O
October	O
16	O
,	O
2001	O
April	O
29	O
,	O
2002	O
November	O
6	O
,	O
2002	O
September	O
16	O
,	O
2003	O
Model	O
info	O
.	O
</s>
<s>
In	O
2003	O
,	O
Apple	O
introduced	O
a	O
new	O
line	O
of	O
PowerBook	B-Operating_System
G4s	I-Operating_System
with	O
12-	O
,	O
15-	O
,	O
and	O
17-inch	O
screens	O
and	O
aluminum	O
cases	O
.	O
</s>
<s>
The	O
new	O
notebooks	B-Device
not	O
only	O
brought	O
a	O
different	O
design	O
to	O
the	O
PowerBook	B-Operating_System
G4	I-Operating_System
line	O
but	O
also	O
laid	O
down	O
the	O
foundation	O
for	O
Apple	O
’s	O
notebook	B-Device
design	O
for	O
the	O
next	O
five	O
years	O
,	O
replaced	O
initially	O
in	O
January	O
2008	O
by	O
the	O
MacBook	B-Device
Air	I-Device
and	O
the	O
subsequent	O
MacBook	B-Device
and	O
MacBook	B-Device
Pro	I-Device
redesigns	O
in	O
October	O
.	O
</s>
<s>
Notably	O
,	O
the	O
12	O
"	O
model	O
brought	O
a	O
welcome	O
return	O
to	O
the	O
Apple	O
subnotebook	B-Device
configuration	O
,	O
conspicuously	O
lacking	O
in	O
their	O
product	O
line	O
since	O
the	O
discontinuation	O
of	O
the	O
PowerBook	B-Device
2400	I-Device
in	O
1998	O
.	O
</s>
<s>
While	O
the	O
titanium	O
PowerBook	B-Operating_System
G4s	I-Operating_System
were	O
capable	O
of	O
booting	O
into	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
or	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
operating	B-General_Concept
systems	I-General_Concept
,	O
the	O
aluminum	O
PowerBook	B-Operating_System
G4s	I-Operating_System
could	O
only	O
boot	O
into	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
.	O
</s>
<s>
Both	O
series	O
of	O
machines	O
could	O
run	O
Mac	B-Operating_System
OS	I-Operating_System
9	I-Operating_System
in	O
Classic	O
mode	O
from	O
within	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
.	O
</s>
<s>
The	O
aluminum	O
PowerBook	B-Operating_System
G4	I-Operating_System
was	O
designed	O
by	O
Apple	O
's	O
Vice	O
President	O
of	O
Industrial	O
Design	O
,	O
Jonathan	O
Ive	O
,	O
and	O
used	O
a	O
radically	O
different	O
design	O
from	O
the	O
preceding	O
titanium	O
models	O
.	O
</s>
<s>
This	O
was	O
the	O
first	O
case	O
of	O
keyboard	O
internal	O
backlighting	O
seen	O
on	O
a	O
notebook	B-Device
computer	I-Device
.	O
</s>
<s>
The	O
design	O
was	O
considered	O
superior	O
to	O
most	O
other	O
notebooks	B-Device
when	O
it	O
debuted	O
in	O
2003	O
,	O
and	O
consequently	O
,	O
it	O
made	O
the	O
PowerBook	B-Operating_System
G4	I-Operating_System
one	O
of	O
the	O
most	O
desirable	O
notebooks	B-Device
on	O
the	O
market	O
.	O
</s>
<s>
The	O
external	O
design	O
of	O
Apple	O
's	O
professional	O
laptops	B-Device
continued	O
to	O
remain	O
similar	O
to	O
the	O
aluminum	O
PowerBook	B-Operating_System
G4	I-Operating_System
until	O
the	O
Spotlight	O
on	O
Notebooks	B-Device
event	O
on	O
October	O
14	O
,	O
2008	O
.	O
</s>
<s>
Some	O
owners	O
have	O
experienced	O
failure	O
of	O
the	O
lower	O
memory	B-Architecture
slot	O
on	O
some	O
of	O
the	O
15	O
"	O
models	O
,	O
with	O
the	O
typical	O
repair	O
being	O
the	O
replacement	O
of	O
the	O
logic	O
board	O
.	O
</s>
<s>
This	O
leaves	O
certain	O
PowerBook	B-Operating_System
G4	I-Operating_System
owners	O
with	O
only	O
a	O
maximum	O
of	O
1	O
GB	O
of	O
RAM	B-Architecture
to	O
use	O
instead	O
of	O
a	O
full	O
2	O
GB	O
.	O
</s>
<s>
Apple	O
previously	O
had	O
a	O
Repair	O
Extension	O
Program	O
to	O
fix	O
the	O
"	O
white	O
spot	O
"	O
issue	O
on	O
its	O
15	O
"	O
PowerBook	B-Device
displays	O
.	O
</s>
<s>
There	O
has	O
also	O
been	O
a	O
rash	O
of	O
reports	O
concerning	O
sudden	O
and	O
pervasive	O
sleeping	O
of	O
1.5	O
and	O
1.67GHz	O
models	O
known	O
as	O
Narcoleptic	O
Aluminum	O
PowerBook	B-Device
Syndrome	O
.	O
</s>
<s>
Symptoms	O
include	O
the	O
PowerBook	B-Device
suddenly	O
entering	O
sleep	O
mode	O
,	O
regardless	O
of	O
the	O
battery	O
level	O
or	O
whether	O
the	O
PowerBook	B-Device
is	O
plugged	O
in	O
.	O
</s>
<s>
The	O
1.67GHz	O
model	O
may	O
suffer	O
from	O
manufacturing	O
or	O
design	O
defects	O
in	O
its	O
display	B-Device
.	O
</s>
<s>
Initial	O
reports	O
pointed	O
to	O
this	O
only	O
being	O
a	O
problem	O
with	O
type	O
M9689	O
17	O
"	O
PowerBooks	B-Device
introduced	O
in	O
Q2	O
2005	O
,	O
but	O
then	O
this	O
problem	O
was	O
also	O
seen	O
in	O
displays	O
replaced	O
by	O
Apple	O
Service	O
Providers	O
in	O
this	O
period	O
(	O
e.g.	O
</s>
<s>
The	O
devices	O
were	O
the	O
last	O
17	O
"	O
models	O
shipped	O
with	O
the	O
matte	O
1440×900	O
pixel	O
low-resolution	O
display	B-Device
.	O
</s>
<s>
On	O
May	O
20	O
,	O
2005	O
,	O
Apple	O
recalled	O
12-inch	O
iBook	B-Device
G4	O
,	O
and	O
12	O
-	O
and	O
15-inch	O
PowerBook	B-Operating_System
G4	I-Operating_System
batteries	O
(	O
model	O
number	O
A1061	O
,	O
first	O
5	O
characters	O
HQ441	O
–	O
HQ507	O
for	O
the	O
iBook	B-Device
,	O
model	O
#	O
A1079	O
,	O
serial	O
#	O
3X446	O
–	O
3X510	O
for	O
12	O
"	O
PowerBook	B-Device
,	O
model	O
#	O
A1078	O
,	O
serial	O
#	O
3X446	O
–	O
3X509	O
.	O
)	O
</s>
<s>
One	O
major	O
factor	O
that	O
led	O
to	O
the	O
discontinuation	O
of	O
the	O
PowerBook	B-Operating_System
G4	I-Operating_System
was	O
Apple	O
's	O
internal	O
experimentation	O
with	O
the	O
PowerPC	B-General_Concept
G5	I-General_Concept
for	O
the	O
company	O
's	O
next	O
line	O
professional-grade	O
notebooks	B-Device
at	O
that	O
time	O
.	O
</s>
<s>
However	O
,	O
the	O
G5	B-Device
,	O
which	O
powered	O
Apple	O
Power	B-Device
Mac	I-Device
G5	I-Device
and	O
iMac	B-Device
G5	I-Device
computers	O
proved	O
to	O
be	O
too	O
power-hungry	O
and	O
heat-intensive	O
to	O
use	O
in	O
a	O
notebook	B-Device
form	O
factor	O
.	O
</s>
<s>
Stalled	O
development	O
of	O
the	O
mobile	O
G5	B-Device
is	O
also	O
said	O
to	O
be	O
another	O
main	O
factor	O
in	O
the	B-Device
Mac	I-Device
's	I-Device
transition	I-Device
from	I-Device
PowerPC	I-Device
to	I-Device
Intel	I-Device
processors	I-Device
.	O
</s>
<s>
After	O
awaiting	O
a	O
new	O
professional-grade	O
notebook	B-Device
to	O
replace	O
the	O
G4	O
,	O
on	O
January	O
10	O
,	O
2006	O
,	O
Apple	O
released	O
the	O
15	O
"	O
MacBook	B-Device
Pro	I-Device
,	O
its	O
first	O
Intel-based	O
notebook	B-Device
.	O
</s>
<s>
A	O
17	O
"	O
version	O
of	O
the	O
MacBook	B-Device
Pro	I-Device
followed	O
on	O
April	O
24	O
,	O
2006	O
.	O
</s>
<s>
The	O
new	O
"	O
MacBook	B-Device
Pro	I-Device
"	O
name	O
was	O
given	O
to	O
the	O
new	O
series	O
of	O
notebooks	B-Device
after	O
Apple	O
changed	O
the	O
portable	O
naming	O
schemes	O
from	O
"	O
Power	O
"	O
for	O
professional	O
products	O
(	O
and	O
"	O
i	O
"	O
for	O
consumer	O
products	O
)	O
,	O
in	O
favor	O
of	O
including	O
"	O
Mac	O
"	O
in	O
the	O
title	O
of	O
all	O
computer	O
lines	O
,	O
with	O
the	O
suffix	O
"	O
Pro	O
"	O
denoting	O
a	O
pro	O
product	O
.	O
</s>
<s>
Finally	O
,	O
on	O
May	O
16	O
,	O
2006	O
,	O
the	O
12	O
"	O
PowerBook	B-Operating_System
G4	I-Operating_System
and	O
the	O
G4	O
iBook	B-Device
were	O
discontinued	O
and	O
replaced	O
by	O
the	O
13.3	O
"	O
MacBook	B-Device
,	O
ending	O
the	O
whole	O
PowerBook	B-Device
line	O
.	O
</s>
<s>
However	O
,	O
a	O
replacement	O
for	O
the	O
12	O
"	O
subnotebook	B-Device
form	O
factor	O
(	O
i.e.	O
</s>
<s>
the	O
12	O
"	O
PowerBook	B-Operating_System
G4	I-Operating_System
)	O
was	O
not	O
immediately	O
forthcoming	O
;	O
the	O
MacBook	B-Device
Air	I-Device
,	O
released	O
in	O
2008	O
,	O
served	O
as	O
an	O
indirect	O
replacement	O
while	O
the	O
13	O
"	O
MacBook	B-Device
Pro	I-Device
released	O
in	O
2009	O
is	O
the	O
direct	O
replacement	O
for	O
the	O
12	O
"	O
PowerBook	B-Operating_System
G4	I-Operating_System
.	O
</s>
<s>
Apple	O
returned	O
to	O
the	O
12	O
"	O
screen	O
size	O
with	O
the	O
MacBook	B-Device
released	O
in	O
2015	O
.	O
</s>
