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Computer
appears
locked
up
and
will
not
turn
off
when
the
power
button
is
pressed.
Cause
Solution
Software
control
of
the
power
switch
is
not
functional.
1.
Press
and
hold
the
power
button
for
at
least
five
seconds
until
the
computer
turns
off.
2.
Disconnect
the
power
cord
from
the
electrical
outlet.
Computer
shuts
down
automatically.
Cause
Solution
Thermal
protection
has
been
activated.
1.
The
computer
might
be
in
an
exceedingly
hot
environment.
Let
it
cool
down.
2.
Clean
the
air
vents
on
the
front,
back,
or
any
other
vented
side
of
the
computer.
3.
Ensure
that
there
is
a
10.2
cm
(4
in)
clearance
on
all
vented
sides
of
the
computer
to
permit
the
required
airflow.
4.
Ensure
that
computers
are
not
stacked
on
top
of
each
other
or
so
near
each
other
that
they
are
subject
to
each
other's
re-circulated
or
preheated
air.
5.
If
the
computer
is
within
an
enclosure,
ensure
that
there
is
proper
intake
and
exhaust
ventilation
for
the
enclosure.
6.
If
a
message
appears
on
the
screen
indicating
that
a
fan
is
not
working,
replace
the
fan.
Computer
will
not
respond
to
USB
keyboard
or
mouse.
Cause
Solution
Computer
is
in
standby
mode.
To
resume
from
standby
mode,
press
the
power
button
or
press
any
key.
CAUTION:
When
attempting
to
resume
from
standby
mode,
do
not
hold
down
the
power
button
for
more
than
four
seconds.
Otherwise,
the
computer
will
shut
down
and
you
will
lose
any
unsaved
data.
Computer
date
and
time
display
is
incorrect.
Cause
Solution
RTC
(real-time
clock)
battery
may
need
to
be
replaced.
NOTE:
Connecting
the
computer
to
a
live
AC
outlet
prolongs
the
life
of
the
RTC
battery.
52
First,
reset
the
date
and
time
under
Control
Panel
(Computer
Setup
can
also
be
used
to
update
the
RTC
date
and
time).
If
the
problem
persists,
replace
the
RTC
battery.