Lenovo 3120, 3122, 3128, 3126 manual Removing the cover presence switch

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6.Remove the screw that secures the cover presence switch (intrusion switch) and remove the cover presence switch from the chassis.

Figure 41. Removing the cover presence switch

46ThinkCentre User Guide

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Contents ThinkCentre User Guide Second Edition December Copyright Lenovo Contents Index Important safety information Iv ThinkCentre User Guide Features Product overviewConnectivity Preinstalled operating system Software overview SpecificationsSoftware provided with your Windows operating system Lenovo ThinkVantage Tools Lenovo Solution Center LocationsLocating connectors and parts on the rear of your computer Front connector, control, and indicator locationsConnector Description If you use speech-recognition software Locating components Locating parts on the system boardLocating internal drives System board part locationsDrive bay locations Installing or replacing hardware Installing or replacing hardwareHandling static-sensitive devices Installing external options Opening the computer coverRemoving and reinstalling the front bezel Removing the front bezelAccessing the system board components and drives What to do nextInstalling or replacing a memory module Removing a memory moduleInstalling or replacing a PCI card Opening the retaining clipsRemoving a PCI card Installing the PCI card Installing or replacing the card reader Installing the card readerInstalling the card reader Installing the screw that secures the card reader Replacing the card reader Installing the card reader Replacing the battery Removing the old battery Replacing the hard disk driveRemoving the hard disk drive Removing the hard disk drive from the bracket Installing the hard disk drive Replacing the optical drivePivoting the optical drive bay Removing the old optical drive Replacing the heat sink and fan assembly Installing a new optical driveScrews that secure the heat sink and fan assembly Removing the heat sink fan duct Replacing the power supply assembly Installing the heat sink fan ductInstalling or replacing hardware Removing the heat sink fan duct Power connectors on the system board Installing the power supply assembly Replacing the microprocessor Accessing the microprocessor Installing or replacing hardware Replacing the internal speaker Removing the front bezel Removing the cover presence switch Removing the internal speaker Installing the new internal speaker Replacing the front audio and USB assembly Reinstalling the cover presence switchRemoving the front audio and USB assembly Replacing the keyboard Replacing the mouseCompleting the parts replacement Mouse connectorsPassword protection Obtaining device drivers Basic security featuresIntegrated cable lock Erasing a lost or forgotten password clearing Cmos Creating and using recovery media Recovery informationCreating recovery media Performing backup and recovery operations Using recovery mediaPerforming a backup operation Performing a recovery operation Using the Rescue and Recovery workspaceUsing a rescue medium Creating and using a rescue mediumCreating a rescue medium Installing or reinstalling device drivers Solving recovery problemsThinkCentre User Guide Using the Setup Utility program Starting the Setup Utility programViewing or changing settings Using passwordsPassword considerations Power-on passwordAdministrator password Setting, changing, or deleting a passwordSelecting a temporary startup device Selecting a startup deviceViewing or changing the startup device sequence Exiting the Setup Utility program Updating flashing the Bios from a disc Using system programsUpdating system programs Updating flashing the Bios from your operating system Recovering from a Post and Bios update failureUpdating system programs ThinkCentre User Guide Troubleshooting and diagnostic programs Basic troubleshootingDiagnostic programs Lenovo Solution CenterLenovo ThinkVantage Toolbox PC-Doctor for DOSOptical mouse Cleaning the mouseNon-optical mouse Troubleshooting and diagnostic programs ThinkCentre User Guide Getting information, help, and service Information resourcesOnline Books folder Lenovo ThinkVantage ToolsAccess Help Safety and warrantyLenovo Welcome Lenovo Support Web siteUsing the documentation and diagnostic programs Help and serviceCalling for service Using other services Purchasing additional servicesAppendix A. Notices Television output notice Trademarks ThinkCentre User Guide Index CRUInstalling options Memory module PCI card Security features Set Power-On Password ThinkCentre User Guide Page 0A94223