Univex 1762, 1962 Your computer cannot connect to the network, Wake on LAN feature is not working

Page 75

•“Your computer cannot connect to the network” on page 63

•“The adapter stops working for no apparent reason” on page 63

•“If your computer is a Gigabit Ethernet model and you use a speed of 1000 Mbps, the connection fails or errors occur” on page 64

•“If your computer is a Gigabit Ethernet model, it cannot connect to the network at 1000 Mbps. Instead, it connects at 100 Mbps” on page 64

Your computer cannot connect to the network

Symptom: Your computer cannot connect to the network.

Actions: Make sure that:

•The cable is installed properly.

The network cable must be securely connected to both the Ethernet connector of your computer and the RJ45 connector of the hub. The maximum allowable distance from the computer to hub is 100 meters. If the cable is connected and the distance is within acceptable limits but the problem persists, try a different cable.

•The cable is installed properly.

•You are using the correct device driver.

On the Windows 7 operating system, do the following:

1.Click Start ➙ Control Panel.

2.Click Hardware and Sound.

3.Click Device Manager. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.

4.If an exclamation mark is displayed next to an adapter name under Network adapters, you might not use the correct driver or the driver is not enabled. To update the driver, right-click the highlighted adapter.

5.Click Update Driver Software, and then follow the instructions on the screen.

•The switch port and the adapter have the same duplex setting.

If you configured the adapter for full duplex, make sure the switch port is also configured for full duplex. Setting the wrong duplex mode can degrade performance, cause data loss, or result in lost connections.

•You have installed all networking software that is necessary for your network environment. Check with your LAN administrator for the necessary networking software.

The adapter stops working for no apparent reason

Symptom: The adapter stops working for no apparent reason.

Action: The network driver files may be corrupt or missing. Update the driver by referring to the “Solution” description for the procedure to make sure that the correct device driver is installed.

The Wake on LAN feature is not working

Symptom: The Wake on LAN (WOL) feature is not working.

Actions:

•Make sure that WOL is enabled in the BIOS Setup Utility program.

•If it is, check with your LAN administrator for the necessary settings.

Chapter 10. Troubleshooting and diagnostics 63

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Contents ThinkCentre User Guide Fourth Edition June Copyright Lenovo 2011 Contents Appendix A. Notices Appendix E. Energy Star model information Index Iv ThinkCentre User Guide Important safety information Service and upgradesStatic electricity prevention Extension cords and related devices Power cords and power adaptersPlugs and outlets External devicesHeat and product ventilation Operating environment Modem safety informationPower supply statement Cleaning and maintenanceLaser compliance statement ThinkCentre User Guide Product overview FeaturesPower supply System management featuresColor temperature adjustment Input/Output I/O featuresPreinstalled operating system Preinstalled software programsSpecifications Software overviewSoftware provided by Lenovo Fingerprint Software Lenovo Solution CenterLenovo ThinkVantage Tools Lenovo WelcomeThinkVantage Rescue and Recovery Product RecoveryThinkVantage Password Manager ThinkVantage Power ManagerCommunication Utility ThinkVantage System UpdateAdobe Reader Antivirus software LocationsFront connector, control, and indicator locations Rear connector locations Locating connectors on the rear of your computerConnector Description Adjusting the computer standMachine type and model label Machine type and model labelThinkCentre User Guide Using Windows shortcut keys Using your computerFrequently asked questions Using the keyboardAbout your computer audio Using a fingerprint readerUsing the wheel mouse Adjusting audioAdding the volume icon to the taskbar Setting the volume from the desktopSetting the volume from Control Panel Using CDs and DVDsUsing the single-touch and multi-touch feature Playing a CD or DVDRecording a CD or DVD Using the multi-touch feature Color temperature adjustmentSelecting a pre-defined color temperature Using the single-touch featureSwitching to RGB adjustment Making brightness adjustmentRed-adjustment Green-adjustment Blue-adjustment Exit Using your computer ThinkCentre User Guide Comfort Accessibility and comfortYou and your computer Arranging your workspaceGlare and lighting Air circulationElectrical outlets and cable lengths Moving your computer to another country or region Voltage-selection switchReplacement power cords Register your computer with LenovoThinkCentre User Guide Security Security featuresUsing passwords Bios passwordsAttaching an integrated cable lock Protecting data against viruses Windows passwordsSetting the fingerprint reader Using and understanding firewallsThinkCentre User Guide Installing or replacing hardware Installing or replacing hardwareInstalling external options Removing the monitor stand Replacing the USB keyboard or mouseConnecting the USB keyboard or mouse Replacing the wireless keyboardReplacing the wireless mouse Opening the battery compartment Obtaining device drivers Recovery information Creating and using recovery mediaCreating recovery media Using recovery media Performing backup and recovery operationsPerforming a backup operation Performing a recovery operation Using the Rescue and Recovery workspaceClick the Restore your system from a backup icon Creating and using a rescue medium Using a rescue mediumCreating a rescue medium Reinstalling preinstalled applications and device drivers Reinstalling preinstalled applicationsReinstalling preinstalled device drivers Reinstalling software programs Reinstalling device driversSolving recovery problems Recovery information ThinkCentre User Guide Using the Setup Utility program Starting the Setup Utility programViewing and changing settings Hard Disk Password Password considerationsPower-On Password Administrator PasswordSelecting or changing the startup device sequence Enabling or disabling a deviceSelecting a startup device Selecting a temporary startup deviceExiting from the Setup Utility program Using system programs Updating flashing the Bios from a discUpdating system programs Click Downloads and drivers Updating flashing the Bios from your operating systemGetting the latest device drivers for your computer Preventing problemsUsing System Update Keeping your computer currentBasics Optical mouse Cleaning your computerComputer KeyboardGood maintenance practices Cleaning a glass-screen surfaceMoving your computer Basic troubleshooting Troubleshooting and diagnosticsTroubleshooting Troubleshooting procedureNo audio in Windows Audio problemsCD problems Sound comes from one external speaker onlyNo audio in DOS applications or games DVD problems CD or DVD does not workBlack screen instead of DVD video Invalid disc or no disc found message DVD movie will not playNo audio or intermittent audio while playing DVD movie Playback is very slow or choppyIntermittent problems Keyboard, mouse, or pointing device problemsAll or some keys on the keyboard do not work Fingerprint reader does not work Wireless keyboard does not work Mouse or pointing device does not work Pointer on the screen does not move smoothly with the mouseMonitor problems Wrong characters appear on the screenImage appears to be flickering Networking problems Ethernet problemsImage is discolored Adapter stops working for no apparent reason Wake on LAN feature is not workingYour computer cannot connect to the network Click Start Control Panel Click Hardware and SoundWireless LAN problem Wireless WAN problemBluetooth problems An option that previously worked does not work now Option problemsAn option that was just installed does not work Sound does not come from the Bluetooth headphoneClick Start Computer Performance and lockup problemsClick Disk Cleanup Insufficient free hard disk drive spacePrinter problems Serial port problemsExcessive number of fragmented files Software does not work as expected Software problemsDiagnostic programs USB problemsPC-Doctor for DOS Lenovo Solution CenterCreating a diagnostic disc Lenovo ThinkVantage ToolboxRunning the diagnostic program from a diagnostic disc ThinkCentre User Guide Getting information, help, and service Lenovo Support Web site Help and serviceUsing the documentation and diagnostic program Calling for servicePurchasing additional services Using other servicesThinkCentre User Guide Appendix A. Notices Trademarks Electronic emissions notices Appendix B. Regulatory informationExport classification notice Television output noticeIndustry Canada Class B emission compliance statement Additional regulatory information ThinkCentre User Guide Appendix C. Weee and recycling information Important Weee InformationRecycling information Recycling information for Brazil Battery recycling information for TaiwanBattery recycling information for the European Union ThinkCentre User Guide Ukraine RoHS China RoHS Turkish RoHSIndia RoHS Windows 7 operating system Appendix E. Energy Star model informationThinkCentre User Guide Index Setting, changing, deleting Page 1P0B03427
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