Lenovo Y471A manual Troubleshooting Sleep or hibernation problems, Computer screen problems

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Chapter 5. Troubleshooting

Sleep or hibernation problems

The critical low-battery error message appears, and the computer immediately turns off.

The computer enters sleep mode immediately after Power-on self-test (POST).

•The battery power is getting low. Connect the AC adapter to the computer, or replace the battery with a fully charged one.

•Make sure that:

-The battery is charged.

-The operating temperature is within the acceptable range. See “Chapter 2. Use and care Information” of Lenovo Safety and General Information Guide.

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. 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.

The screen is unreadable or distorted.

Incorrect characters appear on the screen.

•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 persist, 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.

•Make sure that:

-The display device driver is installed correctly.

-The screen resolution and color quality are correctly set.

-The monitor type is correct.

•Did you install the operating system or application program correctly? If they are installed and configured correctly, have the computer serviced.

Sound problems

No sound can be heard from the

• Make sure that:

speaker even when the volume is

- The Mute function is off.

turned up.

- The headphone jack is not used.

 

- Speakers are selected as the playback device.

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Contents IdeaPad Y471A Regulatory Notice First Edition May Copyright Lenovo Contents Page Top view Getting to know your computerGetting to know your computer Wireless modulePower button Indicators Volume buttonsHeadphone jack RJ-45 portUSB port Microphone jackJack Kensington slot AC power adapterUSB combo port Optical drive System status Bottom view Battery pack Battery latch manual„ Reading the manuals „ Connecting to the power„ Configuring the operating system Learning the basicsShutting down your computer Learning the basicsPutting your computer into sleep state „ Handling the battery „ Checking battery status„ Charging the battery „ Removing the battery packTouchpad button Using the touchpad„ Function key combinations „ Numeric keypadLearning the basics Removing a memory card „ Using memory cards not suppliedInserting a memory card „ Connecting USB devices Enabling Bluetooth communications on your computer „ Connecting a Bluetooth device„ OneKey Rescue system button a „ Volume buttons b- dMute/Unmute Volume down Volume up „ OneKey Theater button e Normal modeMovie mode Intelligent modePerforming dust cleaning Standard modeSuper silent mode Efficient thermal dissipation modeF g Page „ Attaching a security lock not supplied „ Using VeriFace„ Using passwords AMD Muxless ATI Switchable Graphics Technology PowerXpress Switching between Mode 1 and Mode Switchable Graphics in two modes on select modelsCable Connecting to the Internet„ Software configuration „ Hardware connectionSoftware configuration „ Using Wi-Fi/WiMAXConnecting to the Internet Enabling wireless connection„ Introduction OneKey Rescue systemOneKey Rescue system „ Creating a recovery discsFrequently asked questions TroubleshootingWhen do I need to restore the system to the factory status? TroubleshootingKeyboard problems Display problemsPassword problem Sound problems Troubleshooting Sleep or hibernation problemsComputer screen problems OneKey Rescue system problems Troubleshooting Battery problemsHard disk drive problem Startup problemTroubleshooting Other problems Appendix. CRU instructions Handling a hard disk drive Appendix. CRU instructionsAppendix. CRU instructions Appendix. CRU instructions Appendix. CRU instructions Sdram Appendix. CRU instructions Appendix. CRU instructions Removing the optical drive Trademarks Page New World. New Thinking.TM
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