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Lenovo B550, 57323748 manual Troubleshooting Other problems, Your computer does not respond

Models: B550 57323748

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Chapter 5. Troubleshooting

Other problems

Your computer does not respond.

The computer does not start from a device you want.

The connected external device does not work.

•To turn off your computer, press and hold the power button for

4 seconds or more. If the computer still does not respond, remove the AC adapter and the battery.

•Your computer might lock when it enters sleep mode during a communication operation. Disable the sleep timer when you are working on the network.

•See the Boot menu of the BIOS Setup Utility. Make sure that the Boot priority order in the BIOS Setup Utility is set so that the computer starts from the device you want.

•Also make sure that the device from which the computer starts is enabled. In the Boot menu in the BIOS Setup Utility, make sure that the device is included in the Boot priority order list.

•Do not connect or disconnect any external device cables other than USB while the computer power is on; otherwise, you might damage your computer.

•When using a high power consumption external devices such as an external USB optical disk drive, use external device power adapter. Otherwise, the device may not be recognized, or system shut down may result.

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Lenovo B550 Troubleshooting Other problems, Your computer does not respond, The connected external device does not work

Contents

User Guide Lenovo B550First Edition January Copyright Lenovo NotesDear user Dear user Explanation of hard disk capacityAppendix F. Features and ContentsChapter 1. Getting to know your Chapter 6. Upgrading and replacingImportant safety information Important safety information„Read this first DangerCorrect usage procedures Important safety informationDanger DangerImportant safety information Service and upgradesDanger Top view Chapter 1. Getting to know your computerChapter 1. Getting to know your computer aPower buttonc System status select models onlya Kensington slot Chapter 1. Getting to know your computerb Fan louvers c RJ-45porta USB port Chapter 1. Getting to know your computerb Optical drive Right-sideviewChapter 1. Getting to know your computer bIntegrated wireless device switchaSpeakers cMicrophone jack dHeadphone jackb Battery pack a Battery latchd Battery latch Chapter 1. Getting to know your computer„Connecting to the power Chapter 2. Learning the basics„Configuring the operating system Installing the battery pack„Shutting down your computer Chapter 2. Learning the basicsPutting your computer into sleep state „Checking battery status Using AC adapter and battery„Charging the battery „Removing the battery packUsing the touchpad „Handling the batteryChapter 2. Learning the basics a Touchpad„Numeric keypad Using the keyboard„Function key combinations Chapter 2. Learning the basicsChapter 2. Learning the basics Enter sleep modeChapter 2. Learning the basics OneKey Rescue system buttonSpecial button a Caps lock indicator System status indicatorsb Num lock indicator c Power status indicator„Using passwords „Using VeriFace„Attaching a security lock not supplied Chapter 2. Learning the basics„Connecting a universal serial bus USB device Connecting external devicesEnabling Bluetooth communications Chapter 2. Learning the basics„Software configuration Chapter 3. Using the Internet„Hardware connection Cable„Using Wi-Fi/WiMAX Wireless connection„Software configuration Chapter 3. Using the Internet„Introduction Chapter 4. OneKey Rescue systemFrequently asked questions Chapter 5. TroubleshootingHow can I prevent problems with my computer? Where are the recovery discs?What can I do if the backup process fails? Chapter 5. TroubleshootingDisplay problems Chapter 5. TroubleshootingA Password problem TroubleshootingSleep or hibernation problems Chapter 5. TroubleshootingComputer screen problems The screen is blankBattery problems Chapter 5. Troubleshooting Sound problemsA hard disk drive problem A startup problemChapter 5. Troubleshooting Other problems Your computer does not respondThe connected external device does not work Chapter 6. Upgrading and replacing devices Replacing the batteryTo replace the battery, do the following Chapter 6. Upgrading and replacing devices Replacing the hard disk driveHandling a hard disk drive To replace the hard disk drive, do the following5Pull the tab in the direction shown by arrow c Chapter 6. Upgrading and replacing devicesChapter 6. Upgrading and replacing devices To install an SO-DIMM,do the following9Tighten the screws 0Reinstall the battery Chapter 6. Upgrading and replacing devicesa b a Removing the optical drive Chapter 6. Upgrading and replacing devicesTo remove the optical drive, do the following Chapter 6. Upgrading and replacing devices Setup PosterCalling the customer support center Appendix A. Getting help and serviceGetting help around the world Appendix A. Getting help and serviceLenovo warranty service telephone numbers Appendix A. Getting help and serviceWarranty Service Telephone Numbers „Be careful about where and how you work Appendix B. Use, and care informationCaring for your computer „Notice of static-electricity„Carry your computer properly „Be gentle with your computer„For outdoor use „Handle storage media and drives properly„Take care in setting passwords „Data safety„Other important tips Appendix B. Use, and care information„Ergonomic information Accessibility and comfort„What if you are traveling? „Questions about vision?Appendix B. Use, and care information „General tips for maintenance„Cleaning your computer keyboard „Cleaning the cover of your computer„Cleaning your computer display Appendix B. Use, and care informationAppendix C. Lenovo limited warranty „What this warranty covers„How to obtain warranty service Appendix C. Lenovo limited warranty „Replacement of a product or part„Your additional responsibilities information.”Appendix C. Lenovo limited warranty „What this warranty does not cover„Use of personal information „Limitation of liabilityAppendix C. Lenovo limited warranty „Dispute resolution„Other rights „European Economic Area EEA„Suplemento de Garantía para México Appendix C. Lenovo limited warrantyManufactured by: China Tel: +86-512-5735-5000 Marketed byWarranty information Appendix C. Lenovo limited warrantyWarranty period Types of warranty serviceAppendix C. Lenovo limited warranty „Types of warranty service1 Customer Replaceable Unit “CRU” Service 2 On-siteService5Product Exchange Service Appendix C. Lenovo limited warrantyAppendix D. Customer replaceable units CRUs Lenovo United States, Inc Appendix E. Notices1009 Think Place - Building One Morrisville, NC U.S.A Attention: Lenovo Director of LicensingAppendix E. Notices „Export classification noticeAppendix E. Notices ENERGY STAR model informationWindows Windows XPWireless related information „Wireless interoperabilityAppendix E. Notices „Safety information related to Mobile Broadband „Usage environment and your healthAppendix E. Notices „Note to CATV system installer „Products with television tuner options installed„Note to CATV system installer Appendix E. NoticesThis warranty does not cover the following Appendix E. NoticesDanger Electronic emissions notices „Federal Communications Commission FCC StatementAppendix E. Notices „German Class B Compliance Statement „Lenovo Product Service Information „Japanese VCCI Class B StatementAppendix E. Notices „Korea Class B Türkiye EEE Yönetmeliğine Uygunluk BeyanıWEEE and recycling statements „General recycling statementEU WEEE statements Japan recycling statements„Disposing of a Lenovo Computer Components Appendix E. NoticesNotice on deleting data from your hard disk Notice for users in the U.S.AAppendix E. Notices Model Name: Lenovo B550 Appendix F. Features and specificationsForm Factor SystemLenovo Veriface OneKey Index Index Page DO NOT RETURN IT TO THE STORE If your product is not working correctlyNew World. New Thinking.TM P/N: 147003161-1.1Printed in ChinaLenovo China