Lenovo V470, B470 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 Lenovo V470/V570/ B470/B570 Regulatory Notice Contents Page Top view Getting to know your computerGetting to know your computer „ B470 „ B570 Built-in microphone Touchpad Getting to know your computer „ V570/B570 „ V470/B470USB port „ V470/B470 „ V570/B570 Right-side viewMemory card slot GPU Graphics Processing Unit switch Select models onlyDevice switch Select your computer Bottom view SIM card slot Select models only „ Configuring the operating system „ Conncting to the powerLearning the basics „ Reading the manualsShutting down your computer Learning the basics„ Charging the battery „ Checking battery status„ Removing the battery pack „ Handling the batteryRight click button Left click buttonV570/B570 „ Numeric keypadV470/B470 „ Function key combinations Learning the basics „ Connecting a universal serial bus USB device „ Using memory cards not suppliedInserting a memory card Removing a memory cardEnabling Bluetooth communications on your computer „ Connecting a Bluetooth device Select models onlyTo change the GPU, do the following Switching GPU Select models only„ OneKey Rescue system button Special keys and buttonsV470 B470 V570 B570 Page „ Attaching a security lock not supplied „ Using passwords„ Fingerprint reader Select models only „ Active Protection System APS V470/V570 Select models only„ Software configuration Connecting to the Internet„ Hardware connection CableConnecting to the Internet „ Using Wi-Fi/WiMAX Select models onlyEnabling wireless connection Software configuration„ Using Mobile Broadband Select models only Connecting to the Internet Inserting the SIM card V570 Connecting to the Internet Removing the SIM card „ Introduction OneKey Rescue system Frequently asked questions TroubleshootingWhen do I need to restore the system to the factory status? TroubleshootingPassword problem Display problemsSound problems Troubleshooting Sleep or hibernation problemsComputer screen problems Hard disk drive problem Troubleshooting Battery problemsStartup problem OneKey Rescue system problemsTroubleshooting Other problems Appendix A. CRU instructions Replacing the batteryHandling a hard disk drive Appendix A. CRU instructionsAppendix A. CRU instructions Appendix A. CRU instructions Appendix A. CRU instructions Sdram Appendix A. CRU instructions Appendix A. CRU instructions Removing the optical drive only for V470/B470 „ What this warranty covers Appendix B. Lenovo limited warranty„ How to obtain warranty service „ What your service provider will do to correct problems„ Your additional responsibilities „ Replacement of a product or partAppendix B. Lenovo limited warranty „ Limitation of liability „ What this warranty does not cover„ Use of personal information „ European Economic Area EEA „ Dispute resolution„ Other rights Product or Machine type Country or region of purchase „ Types of warranty service Appendix B. Lenovo limited warranty Energy star information Appendix C. Product specific noticesWindows Appendix C. Product specific notices„ Federal Communications Commission FCC Statement Electronic emissions notices„ German Class B Compliance Statement „ Industry Canada Class B Emission Compliance Statement„ Avis de conformité à la réglementation d’Industrie Canada „ European Union Compliance Statement Class B Compliance System Appendix D. SpecificationsPorts OthersTrademarks Index ProblemsPage If your product is not working correctly Do not Return IT to the StoreNew World. New Thinking.TM
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