Lenovo ThinkPad 300 Service Guide - Page 24

Errors, without, messages - thinkpad x300 fan error

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If one of the following error code messages is displayed on the screen, have the computer serviced: 02F4: EISA CMOS not writable 02F5: DMA test failed 02F6: Software NMI failed 02F7: Fail-safe timer NMI failed Fan error Thermal sensing error Errors without messages Problem: When you turn on the computer, nothing appears on the screen and the computer does not beep when starting up. Note: If you are not sure whether you heard any beeps: 1. Turn off the computer by pressing and holding the power switch for 4 seconds or more. 2. Turn it on and listen again. Solution: 1. Make sure that: v The battery is installed correctly. v The AC adapter is connected to the computer and the power cord is plugged into a working electrical outlet. v The computer is turned on. (Turn the power switch on again for confirmation.) 2. If a power-on password is set: a. Press any key to display the prompt for the power-on password. If the brightness level of the screen is low, increase it by pressing the Fn+Home. b. Type the correct password and press Enter. 3. If these items are set properly, and the screen remains blank, have the computer serviced. 16 ThinkPad® X300 Service and Troubleshooting Guide

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If
one
of
the
following
error
code
messages
is
displayed
on
the
screen,
have
the
computer
serviced:
02F4:
EISA
CMOS
not
writable
02F5:
DMA
test
failed
02F6:
Software
NMI
failed
02F7:
Fail-safe
timer
NMI
failed
Fan
error
Thermal
sensing
error
Errors
without
messages
Problem:
When
you
turn
on
the
computer,
nothing
appears
on
the
screen
and
the
computer
does
not
beep
when
starting
up.
Note:
If
you
are
not
sure
whether
you
heard
any
beeps:
1.
Turn
off
the
computer
by
pressing
and
holding
the
power
switch
for
4
seconds
or
more.
2.
Turn
it
on
and
listen
again.
Solution:
1.
Make
sure
that:
v
The
battery
is
installed
correctly.
v
The
AC
adapter
is
connected
to
the
computer
and
the
power
cord
is
plugged
into
a
working
electrical
outlet.
v
The
computer
is
turned
on.
(Turn
the
power
switch
on
again
for
confirmation.)
2.
If
a
power-on
password
is
set:
a.
Press
any
key
to
display
the
prompt
for
the
power-on
password.
If
the
brightness
level
of
the
screen
is
low,
increase
it
by
pressing
the
Fn+Home.
b.
Type
the
correct
password
and
press
Enter.
3.
If
these
items
are
set
properly,
and
the
screen
remains
blank,
have
the
computer
serviced.
16
ThinkPad
®
X300
Service
and
Troubleshooting
Guide