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Lenovo U455 Troubleshooting Password problem, Keyboard problems, Sleep or hibernation problems

Models: U455

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Chapter 5. Troubleshooting

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 administrator 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.

Keyboard problems

A number appears when	• The numeric lock function is on. To disable it, press
you enter a letter.	Fn + F8.

Sleep or hibernation problems

The computer enters sleep	• If the processor overheats, the computer automatically
mode unexpectedly.	enters sleep mode to allow the computer to cool and to
	protect the processor and other internal components.
	Check the settings for sleep mode.

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Lenovo U455 manual Troubleshooting Password problem, Keyboard problems, Sleep or hibernation problems

Contents

Lenovo IdeaPad U455 First Edition December Copyright Lenovo Dear user Explanation of hard disk capacity Page Page Contents Appendix F. Features Contents Appendix B. Use and careAppendix C. Lenovo limited 120Important safety information Important safety information„ Read this first IiiImportant safety information Unpack Important safety information Working place Important safety information Correct usage procedures Vii Important safety informationViii Important safety information Service and upgradesGetting to know your computer Getting to know your computer Power buttonIntegrated CameraFingerprint TouchpadReader Adapter jack Left-side viewRight-side view Bottom view Compartment Battery latch Battery packSIM card slot Select models only MemoryInstalling the battery pack „ Connecting to the powerConnecting the computer to an electrical outlet Learning the basics„ Turning on the computer „ Configuring the operating systemLearning the basics Putting your computer into sleep state„ Shutting down your computer „ Checking battery status Using AC adapter and battery„ Charging the battery „ Removing the battery pack „ Handling the battery Left click button Using the touchpadRight click button Pinch zoom „ GesturesTwo-Finger Scrolling RotatingLearning the basics Three-Finger Flick „ Numeric keypad Using the keyboard„ Function key combinations Fn + F1 Fn + EscFn + F2 Fn + F3„ Using memory cards not supplied Connecting external devices„ Inserting a memory card „ Connecting a universal serial bus USB device„ Removing a memory card Enabling Bluetooth communications on your computer „ Connecting a Bluetooth device Select models onlySwitching GPU Select models only Learning the basics Special keys and buttons Learning the basics OneKey Rescue system button Volume buttons ~Indicator System status indicatorsTouchpad indicator „ Attaching a security lock not supplied Securing your computer„ Using passwords „ Using VeriFace„ Fingerprint reader Wired connection Using the InternetUsing the Internet „ Software configuration„ Hardware connection CableWi-Fi Wireless connectionEnabling wireless connection „ Using Wi-Fi/WiMax Select models onlySoftware configuration Hardware connection„ Using Mobile Broadband Select models only Inserting the SIM card Removing the SIM card Using the Internet OneKey Rescue system OneKey Rescue system„ Introduction OneKey Rescue system OneKey Rescue system Frequently Asked Questions TroubleshootingWhere are the recovery discs? TroubleshootingWhat can I do if the backup process fails? Display problems TroubleshootingComputer is on Problems with GPU switchingKeyboard problems Troubleshooting Password problemSleep or hibernation problems Mode immediately after Sound problems Troubleshooting Computer screen problemsHard disk drive problem Troubleshooting Battery problemsStartup problem Other problems Troubleshooting OneKey Rescue system problemsConnected external To replace the battery, do the following Replacing the batteryUpgrading and replacing devices Upgrading and replacing devices Handling a hard disk drive Replacing the hard disk driveUpgrading and replacing devices Upgrading and replacing devices Upgrading and replacing devices Replacing memory Upgrading and replacing devices Upgrading and replacing devices Upgrading and replacing devices Upgrading and replacing devices Appendix A. Getting help and service Getting help on the Web Appendix A. Getting help and serviceAppendix A. Getting help and service Appendix A. Getting help and service Getting help around the world Appendix B. Use and care information „ Be careful about where and how you workCaring for your computer Appendix B. Use and care information „ Notice of static-electricity„ Carry your computer properly „ Be gentle with your computer„ Handle storage media and drives properly „ For outdoor use„ Take care in setting passwords „ Data safety„ Other important tips Appendix B. Use and care information „ Ergonomic information Accessibility and comfort„ Questions about vision? „ What if you are traveling?„ General tips for maintenance MaintenanceAppendix B. Use and care information „ Cleaning the cover of your computer „ Cleaning your computer keyboard „ Cleaning your computer display „ What this warranty covers Appendix C. Lenovo limited warranty„ What your service provider will do to correct problems „ How to obtain warranty serviceAppendix C. Lenovo limited warranty Information „ Replacement of a product or part „ Use of personal information „ Your additional responsibilities„ What this warranty does not cover „ Limitation of liability „ Dispute resolution „ European Economic Area EEA „ Other rightsLenovo Technology B.V. Turkiye Istanbul Subesi „ Lenovo Turkey addressWarranty information Customer Replaceable Unit CRU Service „ Types of warranty serviceCourier or Depot Service Appendix C. Lenovo limited warranty On-site ServiceCustomer Carry-In or Mail-In Service Product Exchange Service Appendix D. Customer replaceable units CRUs Appendix D. Customer replaceable units CRUs Appendix E. Notices Appendix E. Notices 100 „ Export classification notice101 Energy Star model informationWindows 102„ Wireless interoperability Wireless related information103 104 „ Usage environment and your health105 „ Safety information related to Mobile Broadband106 „ Federal Communications Commission FCC Statement Electronic emissions notices107 108 „ Industry Canada Class B Emission Compliance Statement„ German Class B Compliance Statement „ Avis de conformité à la réglementation d’Industrie Canada109 110 111 „ European Union Compliance Statement Class B Compliance112 „ Korea Class B „ Japan Compliance Statement for Power line Harmonics113 „ General recycling statement Weee and recycling statements114 115 EU Weee statements116 Japan recycling statements117 „ Disposing of a Lenovo Computer Components118 119 120 Appendix F. Features and SpecificationsModel Name IdeaPad U455 Form Factor121 Appendix F. Features and Specifications PortsOthers 122 Trademarks123 IndexIndex 124125 Page If your product is not working correctly Do not Return IT to the StoreNew World. New Thinking.TM