Lenovo ThinkPad W700ds (English) Service and Troubleshooting Guide - Page 26

Errors without messages

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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 I turn on the machine, nothing appears on the screen and the machine does not beep while 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. 18 ThinkPad® W700 and W700ds 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 I turn on the machine, nothing appears on the screen and the machine
does not beep while 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.
18
ThinkPad
®
W700 and W700ds Service and Troubleshooting Guide