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Solution: The control is designed to compensate for minor differences in balance and does not
completely mute either channel.
• Problem: The sound cannot be turned off completely even if you set the Master volume control at
minimum.
Solution: You still can hear some sound even though you have set the Volume Mixer control at minimum.
To turn off the sound completely, press the speaker mute button.
• Problem: When you connect a headphone to your computer while playing sound, a speaker does not
produce sound.
Solution: Once the headphone is attached, the streaming is automatically redirected to it. If you want to
listen to sound from the speakers again, be sure to set those speakers as the default device. For details,
refer to the help information system for Realtek HD Audio.
Fingerprint reader problems
• Problem: The surface of the reader is dirty, stained, or wet.
Solution: Gently clean the surface of the reader with a dry, soft, lint-free cloth.
• Problem: The reader often fails to enroll or authenticate your fingerprint.
Solution: If the surface of the reader is dirty, stained, or wet, gently clean the surface of the reader
with a dry, soft, lint-free cloth.
For tips on how to maintain the fingerprint reader, see "Using the fingerprint reader" on page 59.
Battery and power problems
This topic contains instructions on troubleshooting battery and power problems.
Battery problems
• Problem: The batteries cannot be fully charged in the standard charge time when the computer is
powered off.
Solution: The batteries might be over-discharged. Do the following:
1. Turn off the computer.
2. Connect the ac power adapter to the computer and let it charge.
If a quick charger is available, use it to charge the over-discharged batteries.
If the batteries cannot be fully charged in 24 hours, call Lenovo Customer Service Center.
• Problem: Your computer shuts down before the battery-status icon in the Windows notification area
shows empty, or your computer operates after the battery-status icon in the Windows notification area
shows empty.
Solution: Discharge and recharge the batteries.
• Problem: The operating time for fully charged batteries is short.
Solution: Discharge and recharge the batteries. If your battery operating time is still short, call Lenovo
Customer Service Center.
• Problem: The computer does not operate with fully charged batteries.
Solution: 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.
• Problem: The batteries cannot be charged.
Solution: You cannot charge a battery when it is too hot. Turn off the computer and allow it to cool
to room temperature. After it cools, recharge the batteries. If the batteries still cannot be charged,
call Lenovo Customer Service Center.
.
Chapter 8
Troubleshooting computer problems
101
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