Lenovo B450 Laptop User Guide

Chapter 5. Troubleshooting
37
The computer does not 
return from sleep mode and 
does not work. If the computer does not return from sleep mode, it 
may have entered hibernation mode automatically 
because the battery is depleted. Check the power 
indicator. 
If your computer is in sleep mode connect the AC 
adapter to the computer, then press any key or the 
power button.
If your computer is in hibernation mode or power-off 
state. Connect the AC adapter to the computer, then 
press the power button to...

38
Chapter 5. Troubleshooting
Computer screen problems
The screen is blank. Do the following:
- If you are using the AC adapter, or using the 
battery, and the battery status indicator is on, press 
Fn +
↑ to make the screen brighter. 
- If the power indicator is blinking, press the power 
button to resume from the sleep mode. 
- If the problem persists, follow the solution in the 
following problem “The screen is unreadable or 
distorted.”
The screen is unreadable or 
distorted.Make sure that: 
- The...

Chapter 5. Troubleshooting
39
Sound problems
No sound can be heard 
from the speaker even 
when the volume is turned 
up.Make sure that:
- The Mute function is off.
- The headphone jack is not used.
- The speaker is selected as a playback device.
Battery problems
Your computer shuts down 
before the battery status 
indicator shows empty.
-or-
Your computer operates 
after the battery status 
indicator shows empty.Discharge and recharge the battery.
The operating time for a 
fully charged battery is...

40
Chapter 5. Troubleshooting
A startup problem
The Microsoft® Windows 
operating system does not 
start.Use the OneKey Rescue System to help solve or 
identify your problem. For details on the OneKey 
Rescue System, see “Chapter 4. OneKey Rescue 
System” on page 28.
OneKey Rescue System problems
Backup cannot be made.You are not currently using a Windows operating 
system.
There is not enough space to store the backed up 
data. You will need to free more hard disk space on 
your system partition (C...

Chapter 5. Troubleshooting
41
The computer does not 
start from the desired 
device. See the Boot menu of BIOS Setup Utility. Make sure 
that Boot priority order in BIOS Setup Utility is set 
so that the computer starts from the device you 
want. 
Also make sure that the device from which the 
computer starts is enabled. In the Boot menu in 
BIOS Setup Utility, make sure that the device is 
included in the Boot priority order list.
The connected external 
device does not work. Do not connect or...

42
Chapter 6. Upgrading and replacing devices
Replacing the battery  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
„To replace the battery
1Turn off the computer. Disconnect the AC adapter and all cables from
the computer.
2Close the computer display, and turn the computer over.
Note:Use only the battery provided by Lenovo. Any other battery could ignite or 
explode. 

Chapter 6. Upgrading and replacing devices
43
3Unlock 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.
5Turn the computer over again. Connect the AC adapter and the cables
to the computer again.



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44
Chapter 6. Upgrading and replacing devices
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 drive is very sensitive. Incorrect handling can cause damage and 
permanent loss of data on the hard disk. Before removing the hard...

Chapter 6. Upgrading and replacing devices
45
To replace the hard disk drive, do the following:
1Turn off the computer; then disconnect the AC 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 compartment cover .

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46
Chapter 6. Upgrading and replacing devices
5Pull the tab in the direction shown by arrow .
6Take out the hard disk drive secured in a metal frame .
7Remove the screws and detach the metal frame from the hard disk 
drive.
8Attach the metal frame to a new hard disk drive; then tighten the 
screws.

b

c