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 resume operation.
Note:If the system still does not return from sleep mode, your system has stopped 
responding, and you cannot turn off the computer, reset the computer. However, 
unsaved data may be lost. To reset the computer, press and hold the
 power button 
for 4 seconds or more. If the computer is still not reset, remove the AC adapter and 
the battery. 
						

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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 display device driver is installed correctly.
- The screen resolution and color quality are 
correctly set. 
- The monitor type is correct.
Incorrect characters appear 
on the screen.Did you install the operating system or application 
program correctly? If they are installed and 
configured correctly, have the computer serviced. 
						

							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 
short. For details, see “Handling the battery” in Chapter 2. 
The computer does not 
operate with a fully charged 
battery.The surge protector in the battery might be active. 
Turn off the computer for one minute to reset the 
protector, then turn on the computer again.
The battery does not 
charge.For details, see “Handling the battery” in Chapter 2.
A hard disk drive problem
The hard disk drive does 
not work.In the Boot menu in BIOS Setup Utility, make sure 
that the hard disk drive is included in the Boot 
priority order correctly. 
						

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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 drive).
Fail to restore system 
partition to factory default.The system partition, such as the partition size or the 
drive capacity of C, has been modified.
Other problems
The 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 AC adapter and the battery. 
Your computer might lock when it enters sleep mode 
during a communication operation. Disable the 
sleep timer when you are working on the network. 
						

							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 disconnect any external device 
cables other than USB while the computer power is 
on; otherwise, you might damage your computer.
When using a high power consumption external 
devices such as an external USB optical disk drive, 
use external device power adapter. Otherwise, the 
device may not be recognized, or system shut down 
may result. 
						

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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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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 disk 
drive, make a backup copy of all the information on the hard disk, and then 
turn the computer off. Never remove the drive while the system is 
operating, in sleep mode, or in hibernation mode. 
Notes:
Replace the hard disk drive only if you upgrade it or have it repaired. The 
connectors and bay of the hard disk drive were not designed for frequent 
changes, or drive swapping.
The preinstalled softwares are not included on an optional hard disk drive.
Handling a hard disk drive
Do not drop the drive or subject it to physical shocks. Put the drive on a 
material, such as soft cloth, that absorbs the physical shock.
Do not apply pressure to the cover of the drive. 
Do not touch the connector. 
						

							Chapter 6. Upgrading and replacing devices
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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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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.

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