Lenovo 628323U manual Computer stops responding, Cleaning your computer display

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2.Wipe each key with the cloth. Wipe the keys one by one; if you wipe several keys at a time, the cloth might hook onto an adjacent key and possibly damage it. Ensure that no liquid drips onto or between the keys.

3.Allow to dry.

4.To remove any crumbs or dust from beneath the keys, you can use a camera blower with a brush or cool air from a hair dryer.

Note: Avoid spraying cleaner directly onto the display or the keyboard.

Cleaning your computer display

To clean the computer display, do the following:

1.Gently wipe the display with a dry, soft lint-free cloth. If you see a scratched mark on your display, it might be a stain transferred from the keyboard or the TrackPoint pointing stick when the cover was pressed from the outside.

2.Wipe or dust the stain gently with a soft, dry cloth.

3.If the stain remains, moisten a soft, lint-free cloth with water or a 50-50 mixture of isopropyl alcohol and water that does not contain impurities.

4.Wring out as much of the liquid as you can.

5.Wipe the display again; do not let any liquid drip into the computer.

6.Be sure to dry the display before closing it.

Computer stops responding

Print these instructions now and keep it with your computer for reference later.

If your computer is completely unresponsive (you cannot use the UltraNav pointing device or the keyboard), do the following:

1.Press and hold the power button until the computer turns off. Turn on the computer again by pressing the power button. If the computer does not turn on, continue with step 2.

Note: Do not remove the battery and the ac power adapter to reset the computer.

2.While the computer is turned off, remove all power sources from the computer (battery and the ac power adapter). Hold down the power button for 10 seconds. Plug in the ac power adapter while keeping the battery out of the computer. If the computer does not turn back on, continue with step 3.

Note: Once the computer starts up and enters the operating system, use the proper shutdown procedure to turn the computer off. Once the computer is off, reattach the battery and turn on the computer again. If the computer does not start with the battery reattached, remove the battery and again start with step 2. If the computer starts with ac power but does not start when the battery is attached, call the Customer Support Center for support.

3.While the computer is off, remove all sources of power (battery and the ac power adapter). Remove all external devices that are attached to your computer (keyboard, mouse, printer, scanner, and so on). Repeat step 2. If step 2 is unsuccessful, continue with step 4.

Note: The following steps involve removing static sensitive components from your computer. Ensure that you are properly grounded and remove all sources of power attached to the computer. If you are uncomfortable or unsure about removing components, call the Customer Support Center for assistance.

4.While the computer is off, remove all sources of power and external hardware. Remove any non-original memory module added to your computer. After removing the extra memory module and reseating the original memory module, repeat step 2. If the computer still does not turn on, consult the user manual for other customer-replaceable components that are attached to your computer.

Chapter 5. Troubleshooting computer problems 43

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Contents User Guide Safety, Warranty, and Setup Guide Regulatory Notice Contents Appendix B. Weee and recycling Statements Protect yourself from the heat that your computer generates Read this firstPrevent your computer from getting wet Protect the cables from being damagedConditions that require immediate action Important safety informationHandle your computer gently Carry your computer carefullyService and upgrades Safety guidelinesExtension cords and related devices Power cords and power adaptersPower supply statement Plugs and outletsExternal devices Rechargeable battery notice General battery noticeHeat and product ventilation Electrical current safety informationLiquid crystal display LCD notice Using headphones or earphonesAdditional safety information Xii User Guide Product overview Locating computer controls, connectors, and indicatorsFront view CameraPower button System status indicatorRight-side view MicrophonePower status indicator USB 2.0 connectorAc power connector Media card reader slotUSB 3.0 connectors VGA connectorEthernet connector Left-side viewStatus indicators System status indicatorsBottom view User Guide Power status indicator Wireless status indicatorLocating important product information Machine type and model labelFCC ID and IC Certification number label Specifications FeaturesBattery pack Power source ac power adapterBattery life Operating environmentFrequently asked questions Using your computerHow can I use the battery power more effectively? Registering your computerSpecial keys How do I give presentations or attach an external monitor?How do I attach or replace a device? Using the TrackPoint pointing device Using the UltraNav pointing deviceUsing the touch pad Changing the capCustomizing the touch pad Checking the battery status Power managementUsing the ac power adapter Connecting the ac power adapterMaximizing the battery life Charging the batteryPower-saving modes Handling the batteryUsing your computer Establishing wireless LAN connections Connecting to a wireless LANGo to Settings Internet connection Wi-Fi network Wireless LAN connection statusTips for using the wireless LAN feature Connecting a projector or an external monitorConnecting an external monitor Attaching an external monitorUsing audio features Using the cameraUsing a flash media card Removing a flash media card Inserting a flash media cardUser Guide Accessibility and comfort You and your computerErgonomic information Comfort Accessibility informationTraveling with your computer Travel accessoriesTravel tips Assistive technologiesUser Guide Replacing the battery Replacing devicesStatic electricity prevention User Guide Before you start, print these instructions User Guide Replacing devices Replacing a memory module Replacing devices Replacing the keyboard Replacing devices Installing the keyboard Replacing devices User Guide Replacing devices User Guide Be careful about where and how you work Troubleshooting computer problemsTaking care of your computer Be gentle with your computerCleaning the cover of your computer Computer stops responding Cleaning your computer displayNetworking problems Memory module problemsEthernet problems Spills on the keyboardProblems with the keyboard and other pointing devices Wireless LAN problemAn UltraNav pointing device problem SolutionKeyboard problems Problems with the display and multimedia devicesComputer screen problems Audio problems External monitor problemsBattery and power problems Battery problemsPower problems Sleep problems Power button problemUser Guide Getting help and service Getting supportBefore you contact Lenovo Lenovo Support Web site Calling LenovoTelephone numbers Finding ThinkPad options Purchasing additional servicesUser Guide Location of the UltraConnect wireless antennas Wireless related informationWireless interoperability Appendix A. Regulatory informationExport classification notice Locating wireless regulatory noticesElectronic emission notices Federal Communications Commission Declaration of ConformityAppendix A. Regulatory information User Guide Important Weee information Appendix B. Weee and recycling statementsUser Guide Appendix C. Energy Star model information Power plan Energy Saver settings when plugged into ac powerUser Guide Appendix D. Notices Trademarks Page Part Number Printed 1P P/N
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