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Lenovo U455 manual Mode immediately after

Models: U455

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Chapter 5. Troubleshooting

The computer enters sleep	• Make sure that:
mode immediately after	-	The battery is charged.
Power-on self-test (POST).	-	The operating temperature is within the acceptable
		range. See “Appendix B. Use and care
		information” on page 69.

Note: If the battery is charged and the temperature is within range, have the computer serviced.

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

The computer does not return from sleep mode and does not work.

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

•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. However, 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.

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Lenovo U455 manual Mode immediately after

Contents

Lenovo IdeaPad U455 First Edition December Copyright Lenovo Dear user Explanation of hard disk capacity Page Page Contents Appendix C. Lenovo limited Contents Appendix B. Use and careAppendix F. Features 120„ Read this first Important safety informationImportant safety information IiiImportant safety information Unpack Important safety information Working place Important safety information Correct usage procedures Important safety information ViiImportant safety information Service and upgrades ViiiGetting to know your computer Integrated Power buttonGetting to know your computer CameraReader TouchpadFingerprint Left-side view Adapter jackRight-side view Bottom view SIM card slot Select models only Battery packCompartment Battery latch MemoryConnecting the computer to an electrical outlet „ Connecting to the powerInstalling the battery pack Learning the basicsLearning the basics „ Configuring the operating system„ Turning on the computer Putting your computer into sleep state„ Shutting down your computer „ Charging the battery Using AC adapter and battery„ Checking battery status „ Removing the battery pack „ Handling the battery Right click button Using the touchpadLeft click button Two-Finger Scrolling „ GesturesPinch zoom RotatingLearning the basics Three-Finger Flick Using the keyboard „ Numeric keypad„ Function key combinations Fn + F2 Fn + EscFn + F1 Fn + F3Connecting external devices „ Using memory cards not supplied„ Removing a memory card „ Connecting a universal serial bus USB device„ Inserting a memory card „ Connecting a Bluetooth device Select models only Enabling Bluetooth communications on your computerSwitching GPU Select models only Learning the basics Special keys and buttons Volume buttons ~ Learning the basics OneKey Rescue system buttonTouchpad indicator System status indicatorsIndicator Securing your computer „ Attaching a security lock not supplied„ Using VeriFace „ Using passwords„ Fingerprint reader Using the Internet Wired connection„ Hardware connection „ Software configurationUsing the Internet CableWireless connection Wi-FiSoftware configuration „ Using Wi-Fi/WiMax Select models onlyEnabling wireless connection Hardware connection„ Using Mobile Broadband Select models only Inserting the SIM card Removing the SIM card Using the Internet „ Introduction OneKey Rescue systemOneKey Rescue system OneKey Rescue system OneKey Rescue system Troubleshooting Frequently Asked QuestionsTroubleshooting Where are the recovery discs?What can I do if the backup process fails? Troubleshooting Display problemsProblems with GPU switching Computer is onSleep or hibernation problems Troubleshooting Password problemKeyboard problems Mode immediately after Troubleshooting Computer screen problems Sound problemsStartup problem Troubleshooting Battery problemsHard disk drive problem Troubleshooting OneKey Rescue system problems Other problemsConnected external Upgrading and replacing devices Replacing the batteryTo replace the battery, do the following Upgrading and replacing devices Replacing the hard disk drive Handling a 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 Appendix A. Getting help and service Getting help on the WebAppendix A. Getting help and service Appendix A. Getting help and service Getting help around the world Caring for your computer „ Be careful about where and how you workAppendix B. Use and care information „ Notice of static-electricity Appendix B. Use and care information„ Be gentle with your computer „ Carry your computer properly„ For outdoor use „ Handle storage media and drives properly„ Other important tips „ Data safety„ Take care in setting passwords Appendix B. Use and care information Accessibility and comfort „ Ergonomic information„ What if you are traveling? „ Questions about vision?Maintenance „ General tips for maintenanceAppendix B. Use and care information „ Cleaning the cover of your computer „ Cleaning your computer keyboard „ Cleaning your computer display Appendix C. Lenovo limited warranty „ What this warranty coversAppendix C. Lenovo limited warranty „ How to obtain warranty service„ What your service provider will do to correct problems Information „ Replacement of a product or part „ Your additional responsibilities „ Use of personal information„ What this warranty does not cover „ Limitation of liability „ Dispute resolution „ Other rights „ European Economic Area EEA„ Lenovo Turkey address Lenovo Technology B.V. Turkiye Istanbul SubesiWarranty information „ Types of warranty service Customer Replaceable Unit CRU ServiceCustomer Carry-In or Mail-In Service Appendix C. Lenovo limited warranty On-site ServiceCourier or Depot Service Product Exchange Service Appendix D. Customer replaceable units CRUs Appendix D. Customer replaceable units CRUs Appendix E. Notices Appendix E. Notices „ Export classification notice 100Energy Star model information 101102 Windows103 Wireless related information„ Wireless interoperability „ Usage environment and your health 104„ Safety information related to Mobile Broadband 105106 107 Electronic emissions notices„ Federal Communications Commission FCC Statement „ Industry Canada Class B Emission Compliance Statement 108109 „ Avis de conformité à la réglementation d’Industrie Canada„ German Class B Compliance Statement 110 „ European Union Compliance Statement Class B Compliance 111112 113 „ Japan Compliance Statement for Power line Harmonics„ Korea Class B 114 Weee and recycling statements„ General recycling statement EU Weee statements 115Japan recycling statements 116„ Disposing of a Lenovo Computer Components 117118 119 Model Name IdeaPad U455 Appendix F. Features and Specifications120 Form FactorOthers Appendix F. Features and Specifications Ports121 Trademarks 122Index 123124 Index125 Page Do not Return IT to the Store If your product is not working correctlyNew World. New Thinking.TM