Lenovo B550 Laptop User Guide

							Chapter 5. Troubleshooting
23
 Sleep or hibernation problems
The critical low-battery error 
message appears, and the 
computer immediately turns off.The battery power is getting low. Connect the AC 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 
“Appendix B. Use, and care information” on page 36.
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. 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.
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 in 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.”
-Press Fn+F2 to confirm whether the LCD screen has been turned 
off.
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.
A message, “Unable to create 
overlay window,” appears when you 
try to start DVD playback.
-or-
You get poor or no playback of 
video, DVD or game applications.Do either of the following: 
- If you are using 32-bit color mode, change the color depth to 16-bit 
mode. 
- If you are using a desktop resolution over the optimum, reduce the 
display resolution and the color depth. 
						

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Chapter 5. Troubleshooting
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.
- Speakers are selected as the 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.
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 about OneKey Rescue system, see “Chapter 4. 
OneKey Rescue system” on page 19.
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. 
						

							Chapter 5. Troubleshooting
25
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 
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.
The computer does not start from a 
device you want. See the Boot menu of the BIOS Setup Utility. Make sure that the 
Boot priority order in the 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 the 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, do the following:
1Turn off the computer, or enter hibernation mode. Disconnect the AC adapter and all cables
from the computer.
2Close the computer display, and turn the computer over.
3Unlock the manual battery latch  . 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.
5Slide the manual battery latch to the locked position.
6Turn the computer over again. Connect the AC adapter and the cables to the computer again.
Note:Use only the battery provided by Lenovo. Any other battery could ignite or explode.
a
bc
b
a
c 
						

							Chapter 6. Upgrading and replacing devices
27
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. 
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 (HDD) compartment cover.
a. Loosen the screws that secure the compartment cover  .
b. Remove the compartment cover  .
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.
a
b
a
b 
						

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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.
9Put 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.
0After aligning the attachment clips with their matching gaps, reinstall the compartment
cover.
ATighten the screws.
BReinstall the battery pack.
CTurn the computer over again. Connect the AC adapter and the cables to the computer
again.
c
c
d
d 
						

							Chapter 6. Upgrading and replacing devices
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Replacing memory  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
You can increase the amount of memory in your computer by installing a double data rate 
(DDR3) small outline dual inline memory module (SO-DIMM)-available as an option-in the
memory slot of your computer. SO-DIMMs are available in various capacities.
To install an SO-DIMM, do the following: 
1Touch a metal table or a grounded metal object to reduce any static electricity in your body,
which could damage the SO-DIMM. Do not touch the contact edge of the SO-DIMM. 
2Turn off the computer. Disconnect the AC adapter and all cables from the computer.
3Close the computer display, and turn the computer over. 
4Remove the battery pack.
5Remove the Memory/CPU (Central processing unit)/Mini PCI Express Card slot 
compartment cover.
a. Loosen the screws that secure the compartment cover  .
b. Remove the compartment cover  .
Note:Use only the memory types supported by your computer. If you incorrectly install the optional 
memory or install an unsupported memory type, a warning beep will sound when you try to start the 
computer.
a
b
ab 
						

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Chapter 6. Upgrading and replacing devices
6Press outwards on the latches on both edges of the socket at the same time, remove the 
SO-DIMM. Be sure to save the old SO-DIMM for future use.
7Insert the notched end of the DIMM into the socket.
Press the DIMM firmly, and pivot it until it snaps into the place. Make sure that it is firmly
fixed in the slot and does not move easily.
8After aligning the attachment clips with their matching gaps, reinstall the compartment
cover.
9Tighten the screws.
0Reinstall the battery.
ATurn the computer over again. Connect the AC adapter and the cables to the computer .
a
ab 
						

							Chapter 6. Upgrading and replacing devices
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To make sure that the SO-DIMM is installed correctly, do as follows:
1Turn the computer on.
2Hold F2 during startup. The BIOS Setup Utility screen opens. The Total Memory item 
shows the total amount of memory installed in your computer. 
Removing the optical drive   - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
To remove the optical drive, do the following:
1Remove the Memory/CPU (Central processing unit)/Mini PCI Express Card slot 
compartment cover.
2Remove the screw shown in the illustration  .
3Gently pull the optical drive out  .
Note:If only one DIMM is used on the computer you are servicing, the card must be installed in SLOT-0 
( : lower slot), but not in SLOT-1 ( : upper slot).
ab
b
a
a
b
b
a 
						

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Chapter 6. Upgrading and replacing devices
The following table provides a list of CRUs (Customer Replaceable Units) for your computer
and tells where to find the replacement instructions.
Setup Poster User Guide
Self-service CRUs
AC adapter O
Power cord for AC 
adapterO
Battery O O
Bottom access doors O
Hard disk drive O
MemoryO
Optical drive O