<s>
Double	B-Device
boot	I-Device
(	O
also	O
known	O
as	O
cold	B-Device
double	I-Device
boot	I-Device
,	O
double	B-Device
cold	I-Device
boot	I-Device
,	O
double	B-Device
POST	I-Device
,	O
power-on	B-Device
auto	I-Device
reboot	I-Device
,	O
or	O
fake	B-Device
boot	I-Device
)	O
is	O
a	O
feature	O
of	O
the	O
BIOS	B-Operating_System
,	O
and	O
may	O
occur	O
after	O
changes	O
to	O
the	O
BIOS	B-Operating_System
 '	O
settings	O
or	O
the	O
system	O
's	O
configuration	O
,	O
or	O
a	O
power	O
failure	O
while	O
the	O
system	O
was	O
in	O
one	O
of	O
certain	O
sleep	O
modes	O
.	O
</s>
<s>
Changing	O
some	O
parameters	O
in	O
the	O
BIOS	B-Operating_System
will	O
cause	O
this	O
issue	O
,	O
even	O
for	O
items	O
as	O
simple	O
as	O
initializing	O
the	O
current	O
CPU	B-Device
and	O
memory	O
clocks	O
.	O
</s>
<s>
At	O
such	O
times	O
,	O
a	O
reboot	B-Device
will	O
be	O
required	O
.	O
</s>
<s>
If	O
the	O
computer	O
did	O
not	O
have	O
any	O
power	O
and	O
had	O
just	O
been	O
plugged	O
in	O
,	O
the	O
same	O
parameters	O
would	O
need	O
to	O
be	O
implemented	O
again	O
,	O
and	O
since	O
these	O
parameters	O
require	O
a	O
reboot	B-Device
,	O
the	O
computer	O
will	O
do	O
a	O
quick	O
reset	B-General_Concept
to	O
implement	O
the	O
parameters	O
that	O
are	O
set	O
in	O
the	O
BIOS	B-Operating_System
.	O
</s>
<s>
In	O
a	O
double	B-Device
boot	I-Device
,	O
the	O
PC	B-Device
will	O
power	O
on	O
for	O
about	O
two	O
seconds	O
,	O
off	O
for	O
about	O
a	O
second	O
,	O
turn	O
back	O
on	O
,	O
display	O
the	O
POST	B-Device
screen	I-Device
,	O
and	O
then	O
continue	O
to	O
boot	B-Operating_System
up	I-Operating_System
normally	O
.	O
</s>
