Lenovo Ideapad 305 15iby User Guide

Chapter 4. Troubleshooting
25
When do I need to change the boot priority?
The default boot priorities are UEFI First. If you need to install a legacy 
operating system (that is, an earlier version than that of your current 
operating system) on your computer, you will need to change the boot 
priority to Legacy First. The legacy operating system cannot be installed if 
you do not change the boot priority.
Getting help
How can I contact the customer support center?
See “Chapter 3. Getting help and...

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Chapter 4. Troubleshooting
Troubleshooting  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Display problems
When I turn on the 
computer, nothing appears 
on 
the screen.• If the screen is blank, make sure that:
- The AC power adapter is connected to the 
computer, and the power cord is plugged into a 
working electrical outlet.
- The computer power...

Chapter 4. Troubleshooting
27
BIOS password problems
I forgot my password.• If you forget your user password, you must ask the 
system administrator to reset your user password.
• If you 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 representative to have the hard disk drive 
replaced. Proof of purchase is required, and a fee 
will be charged for parts and...

28
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.• Reset the battery gauge using Lenovo Energy 
Management....

Chapter 4. Troubleshooting
29
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 battery pack and the 
AC power adapter. 
• 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 EFI list of the BIOS setup utility. Make...

30
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, which might 
require some technical skills or tools, or request that a technician install the 
optional-service CRU under the...

Appendix A. CRU instructions
31
Replacing the battery pack  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
To replace the battery pack, do the following:
1Unlock the manual battery latch  . While holding the spring-loaded 
battery latch in the unlocked positi on  , remove the battery pack in the 
direction shown by the arrow  . 
2Install a fully charged battery pack.
3Slide the manual battery latch to the locked position....

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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....

Appendix A. CRU instructions
33
To replace the hard disk drive, do the following:
1Remove the battery pack. For details, see “Replacing the battery pack” on 
page 31.
2Remove the screws  , and then remove the bottom slot cover  .
3Remove the frame fixing screws  .
ab
1
2
1
c
3
3 

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Appendix A. CRU instructions
4Remove the hard disk drive by gently pulling it in the direction of the 
arrow .
5Remove the screws and detach the metal frame from the hard disk drive.
6Attach the metal frame to a new hard disk drive and tighten the screws.
7Slide the new hard disk drive firmly into place, and then reinstall the 
frame fixing screws to secure the drive.
8Reinstall the bottom slot cover and tighten the screws.
9Reinstall the battery pack. For details, see “Replacing the battery pack” on...