Lenovo B4400 Laptop User Guide

Chapter 4. Troubleshooting
27
 Sleep problems
The critical low-battery error 
message appears, and the 
computer immediately turns 
off.The battery power is getting low. Connect the AC 
power adapter to the computer, or replace the battery 
with a fully charged one.
The computer enters 
sleep mode 
immediately after Power-on 
self-test (POST). Make sure that: 
- The battery is charged.
- The operating temperature is within the acceptable 
range. See “Chapter 2. Use and care Information” of 
Lenovo Safety...

28
Chapter 4. Troubleshooting
A hard disk drive problem
The hard disk drive does 
not work.In the Startup menu in the BIOS setup utility, make 
sure that the hard disk drive is included in the Boot 
Priority Order list.
Other problems
Your computer does not 
respond.To turn off your computer, press and hold the power 
button for 4 seconds or more. If the computer still 
does not respond, remove the battery pack and the 
AC power adapter. 
Your computer might lock when it enters sleep mode 
during a...

29
Appendix. CRU (Customer Replaceable Units) 
instructions
Replacing the battery  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
To replace the battery, do the following:
1Turn off the computer. Disconnect the AC power adapter and all cables 
from the computer.
2Close the computer display, and turn the computer over.
3Unlock the manual battery latch  . Hold the spring-loaded battery latch 
in the unlocked...

30
Appendix. CRU (Customer Replaceable Units) instructions
4Install a fully charged battery.
5Slide the manual battery latch to the locked position.
6Turn the computer over again. 
7Connect the AC power adapter and the cables to the computer. 

Appendix. CRU (Customer Replaceable Units) instructions
31
Replacing the backup battery  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
To replace the backup battery, do the following:
1Turn off the computer, then disconnect the AC power adapter and all 
cables from the computer.
2Close the computer display, and then turn the computer over.
3Remove the battery pack.
4Remove the Hard disk drive/Memory/Mini PCI Express Card slot...

32
Appendix. CRU (Customer Replaceable Units) instructions
5Disconnect the backup battery cable connector  , then pull the backup 
battery upward to remove  .
6Install a new backup battery.
7Reinstall the compartment cover and tighten the screws.
8Reinstall the battery pack.
9Turn the computer over again.
0Connect the AC power adapter and the cables to the computer.
a
b
b
a 

Appendix. CRU (Customer Replaceable Units) instructions
33
Replacing the hard disk drive  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
You can increase the storage capacity of your computer by replacing the hard 
disk drive with one of greater capacity. You can purchase a new hard disk 
drive from your reseller or Lenovo marketing representative.
The hard disk drive is very sensitive. Incorrect handling may cause damage 
and permanent loss...

34
Appendix. CRU (Customer Replaceable Units) instructions
To replace the hard disk drive, do the following:
1Turn off the computer, then disconnect the AC power adapter and all 
cables from the computer.
2Close the computer display, and then turn the computer over.
3Remove the battery pack.
4Remove the Hard disk drive/Memory/Mini PCI Express Card slot 
compartment cover.
a. Loosen the screws that secure the compartment cover  .
b. Remove the compartment cover  .
a
b
b
a 

Appendix. CRU (Customer Replaceable Units) instructions
35
5Remove the frame fixing screws  .
6Pull the tab in the direction shown by arrow  .
c
c
d
d 

36
Appendix. CRU (Customer Replaceable Units) instructions
7Take out the hard disk drive secured in a metal frame  .
8Remove the screws and detach the metal frame from the hard disk drive.
9Attach the metal frame to a new hard disk drive and tighten the screws.
0Put the hard disk drive gently into the hard disk drive bay with the tab
facing upwards and the connectors facing each other, then push it firmly
into space.
AReinstall the frame fixing screw.
BReinstall the compartment cover and tighten the...