Lenovo 3120, 3122, 3128, 3126 manual Erasing a lost or forgotten password clearing Cmos

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Erasing a lost or forgotten password (clearing CMOS)

This section provides instructions on how to erase a lost or forgotten password, such as a user password.

To erase a lost or forgotten password, do the following:

1.Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect all power cords from electrical outlets and disconnect all cables that are connected to the computer.

2.Open the computer cover. See “Opening the computer cover” on page 14.

3.Locate the Clear CMOS /Recovery jumper on the system board. See “Locating parts on the system board” on page 10.

4.Remove any parts and disconnect any cables that might prevent your access to the Clear CMOS /Recovery jumper.

5.Move the jumper from the standard position (pin 1 and pin 2) to the maintenance position (pin 2 and pin 3).

6.Reinstall any parts and reconnect any cables that have been removed or disconnected.

7.Reinstall the computer cover and reconnect the power cords for the computer and monitor. See “Completing the parts replacement” on page 52.

8.Turn on the computer and leave it on for approximately 10 seconds. Then, turn off the computer by holding the power switch for approximately five seconds.

9.Repeat step 1 through step 4.

10.Move the Clear CMOS /Recovery jumper back to the standard position (pin 1 and pin 2).

11.Reinstall any parts and reconnect any cables that have been removed or disconnected.

12.Close the computer cover and reconnect all cables. See “Completing the parts replacement” on page 52.

13.Turn on the computer. Your password has been erased and you can use the Setup Utility program to set a new password. See Chapter 4 “Using the Setup Utility program” on page 61 for more information.

54ThinkCentre 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 Specifications Software overviewSoftware 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 connectorsObtaining device drivers Basic security features Password protectionIntegrated cable lock Erasing a lost or forgotten password clearing Cmos 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 workspaceCreating and using a rescue medium 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 startup device Selecting a temporary startup deviceViewing or changing the startup device sequence Exiting the Setup Utility program Using system programs Updating flashing the Bios from a discUpdating 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 DOSCleaning the mouse Optical 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 siteHelp and service Using the documentation and diagnostic programsCalling 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