Lenovo B470, V470 manual Display problems, Password problem

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Chapter 5. Troubleshooting

Troubleshooting -------------------------------------------------------------------------------------------------------------

If you do not find your problem here, see Chapter 2. The following section only describes problems that might negate the need to refer to the more comprehensive information in Chapter 2.

Display problems

When I turn on the computer, nothing appears on the screen.

When I turn on the computer, only a white cursor appears on a blank screen.

My screen goes blank while the computer is on.

•If the screen is blank, make sure that:

-The battery is installed correctly.

-The AC adapter is connected to the computer and the power cord is plugged into a working electrical outlet.

-The computer power is on. (Press the power button again for confirmation.)

-The memory is installed correctly.

•If these items are properly set, and the screen remains blank, have the computer serviced.

•Restore backed-up files to your Windows environment or the entire contents of your hard disk to the original factory contents using OneKey Recovery. If you still see only the cursor on the screen, have the computer serviced.

•Your screen saver or power management may be enabled. Do one of the following to exit from the screen saver or to resume from sleep or hibernation mode:

-Touch the touchpad.

-Press any key on the keyboard.

-Press the power button.

•Press Fn + F2 to confirm whether the LCD screen has been turned off.

A Password problem

I forgot my password.	• If you forget your user password, you must take your computer to a
	Lenovo authorized servicer or a marketing representative to have
	the password changed.
	• 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
	service.
	• If you forget your supervisor password, a Lenovo authorized
	servicer cannot reset your password. You must take your computer
	to a Lenovo authorized servicer or a marketing representative to
	have the system board replaced. Proof of purchase is required, and a
	fee will be charged for parts and service.

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Contents Lenovo V470/V570/ B470/B570 Regulatory Notice Contents Page Getting to know your computer Top viewGetting to know your computer „ B470 „ B570 Built-in microphone Touchpad Getting to know your computer „ V470/B470 „ V570/B570USB port Right-side view „ V470/B470 „ V570/B570Device switch Select your computer GPU Graphics Processing Unit switch Select models onlyMemory card slot Bottom view SIM card slot Select models only „ Conncting to the power „ Configuring the operating systemLearning the basics „ Reading the manualsLearning the basics Shutting down your computer„ Checking battery status „ Charging the battery„ Removing the battery pack „ Handling the batteryLeft click button Right click buttonV470/B470 „ Numeric keypadV570/B570 „ Function key combinations Learning the basics „ Using memory cards not supplied „ Connecting a universal serial bus USB deviceInserting a memory card Removing a memory card„ Connecting a Bluetooth device Select models only Enabling Bluetooth communications on your computerSwitching GPU Select models only To change the GPU, do the followingSpecial keys and buttons „ OneKey Rescue system buttonV470 B470 V570 B570 Page „ Using passwords „ Attaching a security lock not supplied„ Fingerprint reader Select models only „ Active Protection System APS V470/V570 Select models onlyConnecting to the Internet „ Software configuration„ Hardware connection Cable„ Using Wi-Fi/WiMAX Select models only Connecting to the InternetEnabling 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 OneKey Rescue system „ IntroductionTroubleshooting Frequently asked questionsTroubleshooting When do I need to restore the system to the factory status?Display problems Password problemComputer screen problems Troubleshooting Sleep or hibernation problemsSound problems Troubleshooting Battery problems Hard disk drive problemStartup problem OneKey Rescue system problemsTroubleshooting Other problems Replacing the battery Appendix A. CRU instructionsAppendix A. CRU instructions Handling a hard disk driveAppendix 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 Appendix B. Lenovo limited warranty „ What this warranty covers„ How to obtain warranty service „ What your service provider will do to correct problemsAppendix B. Lenovo limited warranty „ Replacement of a product or part„ Your additional responsibilities „ Use of personal information „ What this warranty does not cover„ Limitation of liability „ Other rights „ Dispute resolution„ European Economic Area EEA Product or Machine type Country or region of purchase „ Types of warranty service Appendix B. Lenovo limited warranty Appendix C. Product specific notices Energy star informationAppendix C. Product specific notices WindowsElectronic emissions notices „ Federal Communications Commission FCC Statement„ Avis de conformité à la réglementation d’Industrie Canada „ Industry Canada Class B Emission Compliance Statement„ German Class B Compliance Statement „ European Union Compliance Statement Class B Compliance Appendix D. Specifications SystemPorts OthersTrademarks Problems IndexPage Do not Return IT to the Store If your product is not working correctlyNew World. New Thinking.TM