Lenovo B5400 Laptop User Guide

Chapter 4. Troubleshooting
25
BIOS password problems
I forgot my password.u forget your user password, you must ask the 
system administrator to reset your user password.
u forget your HDD password, a Lenovo 
authorized servicer cannot reset your password or 
recover data from the hard disk. You must take your 
computer to a Lenovo authorized servicer or a 
marketing represent
ative to have the hard disk drive 
replaced. Proof of purchase is required, and a fee will 
be charged for parts and service.
u...

26
Chapter 4. Troubleshooting
Sound problems
No sound can be heard 
from the speakers even 
when the volume is turned 
up. Make sure that:
-The mute function is off.
-The combo audio jack is not used.
- The speakers are selected as the playback device. 
Battery problems
Your computer shuts down 
before the power and 
battery status indicator 
shows empty.
-or-
Your computer operates 
after the power and battery 
status indicator shows 
empty.t the battery gauge using Lenovo Energy 
Management. If the...

Chapter 4. Troubleshooting
27
Other problems
Your computer does not 
respond.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. 
ur computer might lock when it enters sleep mode 
during a communication operation. Disable the sleep 
timer when you are working on the network.
I need to start the computer 
from a connected device, 
but the device does not 
appear on the boot device...

28
Appendix A. CRU instructions
Customer Replaceable Units (CRUs) are parts that can be upgraded or 
replaced by the customer. If a CRU is determined to be defective during the 
warranty period, a replacement CRU will be provided to the customer. 
Customers are responsible for installing the self-service CRUs for this 
product. Customers also can install optional-service CRUs, wh
ich might 
require some technical skills or tools, or request that a technician install the 
optional-service CRU under the...

Appendix A. CRU instructions
29
3Unlock the manual battery latch . While holding the spring-loaded 
battery latch in the unlocked position , remove the battery pack in the 
direction shown by the arrow  . 
4Install a fully charged battery pack.
5Slide the manual battery latch to the locked position.
6Turn the computer over and reconnect the AC power adapter.
a
b
c
3
1
2
1
2
1
2 

30
Appendix A. CRU instructions
Replacing the backup battery  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
To  r e p l a c e  the backup battery, do the following:
1Turn off the computer. Disconnect the AC power adapter and all cables 
from the computer. Wait three to five minutes to let the computer cool.
2Close the computer display, and turn the computer over.
3Remove the battery. For details, see “Replacing the battery pack” on page...

Appendix A. CRU instructions
31
5Unplug the backup battery connector, and then remove the backup 
battery .
6Install a new backup battery. Insert the backup battery connection firmly. 
7Reinstall the computer cover, and then reinstall the screws.
8Reinstall the battery. For details, see “Replacing the battery pack” on 
page 28.
9Turn the computer over again. Reconnect the AC power adapter and all 
cables.
c
3 

32
Appendix A. CRU instructions
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 can cause damage 
and permanent loss of data on the hard disk....

Appendix A. CRU instructions
33
To  r e p l a c e  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. For details, see “Replacing the battery pack” on 
page 28.
4Remove the screws  , and then remove the bottom slot cover .ab
1
1
2
1
2 

34
Appendix A. CRU instructions
5Remove the frame fixing screw  .
6Remove the hard disk drive by gently pulling in the direction of the 
arrow .
7Remove the screws and detach the metal frame from the hard disk drive.
8Attach the metal frame to a new hard disk drive and tighten the screws.
9Slide the new hard disk drive firmly into place, and then reinstall the 
frame fixing screw to secure the drive.
0Reinstall the bottom slot cover and tighten the screws.
AReinstall the battery pack. For details, see...