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 forget your Supervisor password, a Lenovo 
authorized servicer cannot reset your password. You 
must take your computer to a Lenovo authorized 
servicer or a marketing representative to have the 
system board replaced. Proof of purchase i
s required, 
and a fee will be charged for parts and service.
 Sleep problems
The critical low-battery error 
message appears, and the 
computer immediately turns 
off.ttery 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” in 
the Lenovo Safety and General In
formation Guide.
Note:  If the battery is charged and the temperature is within range, have the computer serviced.
The computer does not 
return from sleep mode, 
and the computer does not 
work. ur computer is in sleep mode, connect the AC 
power adapter to the computer and then press the Fn 
key or the power button.
the system still does not return from sleep mode, 
stops responding, or cannot be turned off, reset the 
computer. Unsaved data may be lost. To reset the 
computer, press and hold the power button for 4 
seconds or more. 
						

							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 problem persists, replace with a 
new battery pack.
The computer does not 
operate with a fully charged 
battery.urge protector in the battery might be active. 
Turn off the computer for one minute to reset the 
protector; then turn on the comput
er again.
A hard disk drive problem
The hard disk drive does 
not work. Make sure that the hard disk drive is included in the 
Boot Menu in the BIOS setup utility correctly. 
						

							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 
list.the boot mode setting in the BIOS setup util
ity.  
If Boot Mode is set to UEFI, make sure that the device 
or the medium in the device supports UEFI boot. If 
the device or the medium in the device does not 
support UEFI boot, set Boot Mode to Legacy Support. 
If the device still does not appear in the boot device 
list, replace with a new de
vice or medium.
The connected external 
device does not work. t connect or disconnect any external device 
cables other than USB while the computer power is 
on; otherwise, you might damage your computer.
using a high power consumption external 
device such as an external USB optical disk drive, use 
an external device power adapter. Otherwise, the 
device migh
t not be recognized, or system shut down 
might result. 
						

							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 terms of the applicable warranty service 
type for your country or region.
Replacing the battery pack  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
To  r e p l a c e  the battery pack, 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.
Notes: 
illustrations used in this chapter are of the Lenovo M5400, unless otherwise stated.
illustrations in this manual might differ from the actual product. Please refer to the 
actual product.
Note:  Use only the battery provided by Lenovo. Any other battery could ignite or explode. 
						

							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 28.
4Remove the screws  , and then remove the cover .ab
1
1
2
1
2 
						

							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. Before removing the hard disk 
drive, make a backup copy of all t
he information on the hard disk, and then 
turn the computer off. Never remove the hard disk drive while the system is 
operating or in sleep mode.
Notes: 
Replace the hard disk drive only for upgrades or repair.  T h e  c o n n e ctors and bay of the hard 
disk drive were not designed for frequent changes, or drive swapping.
The preinstalled software are not included on an optional hard disk drive.
Handling a hard disk drive
t drop the drive or subject it to physical shock. Put the drive on a material, 
such as soft cloth, that absorbs any physical shock.
t apply pressure to the cover of the drive. 
t touch the connector. 
						

							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 “Replacing the battery pack” on
page 28.
BTurn the computer over again. Reconnect the AC power adapter and the
cables to the computer.
c
3
d
4