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...

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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...

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...

26
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  ....

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...

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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...

Chapter 6. Upgrading and replacing devices
29
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...

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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....

Chapter 6. Upgrading and replacing devices
31
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...

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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