Lenovo TC A51-8428, TC A51-8425, TC A51-8424 Erasing a lost or forgotten password clearing Cmos

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Erasing a lost or forgotten password (clearing CMOS)

This section applies to lost or forgotten passwords. For more information about lost or forgotten passwords, go to Access IBM.

To erase a forgotten password:

1.Refer to “Accessing system board components and drives” on page 14.

2.Locate the Clear CMOS/BIOS recovery jumper on the system board. See “Identifying parts on the system board” on page 15.

3.Move the jumper from the standard position (pins 1 and 2) to the maintenance or configure position (pins 2 and 3).

4.Install the PCI riser and adapters if removed.

5.Lower the drive bay assembly and reconnect any cables that were disconnected.

6.Close the cover and connect the power cable. See “Closing the cover and connecting the cables.”

7.Restart the computer, leave it on for approximately 10 seconds, and then turn off the computer.

8.Repeat step 1.

9.Move the CMOS/BIOS recovery jumper back to the standard position (pins 1 and 2).

10.Reassemble the computer and close the cover. See “Closing the cover and connecting the cables.”

Closing the cover and connecting the cables

After working with options, you need to install any removed parts, close the cover, and reconnect cables, including telephone lines and power cords. Also, depending on the option that is installed, you might need to confirm the updated information in the IBM Setup Utility program.

To close the cover and connect cables to your computer:

1.Ensure that all components have been reassembled correctly and that no tools or loose screws are left inside your computer.

2.Clear any cables that might impede the replacement of the cover.

3.Make sure the drive bay assembly is lowered and that the drive locks are both in the locked position. Otherwise, you cannot close the cover.

4.Close the cover.

5.If a cover lock is installed, lock the cover.

6.If your computer is being placed in the vertical position, attach the floor stand.

Attention: To prevent overheating and possible component damage, always attach the floor stand when placing the computer in the vertical position.

7.Reconnect the external cables and power cords to the computer. See “Locating connectors on the rear of your computer” on page 11.

8.To update the configuration, see Chapter 3, “Using the IBM Setup Utility,” on page 25.

24User Guide

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Contents User Guide Types 8424, 8425 Types 8171, 8172 Page User Guide Types 8424, 8425 Types 8171, 8172 Page Contents Iv User Guide Important safety information Conditions that require immediate actionPower cords and power adapters General safety guidelinesService Batteries Extension cords and related devicesPlugs and outlets Heat and product ventilation CD and DVD drive safetyAdditional safety information To connect To disconnect Connexion Déconnexion Lithium battery noticeModem safety information Laser compliance statement Consignes de sécurité relatives au modemXii User Guide Overview Information resourcesFeatures Security features Input/output featuresPower ExpansionIBM preinstalled software Operating systems preinstalled varies by model Available optionsSpecifications Supported operating positions User Guide Handling static-sensitive devices Installing optionsInstalling external options Cover keylock some models Locating connectors on the rear of your computer Obtaining device driversOpening the cover Locating components Accessing system board components and drives Identifying parts on the system board Installing memory Installing PCI adapters Removing and replacing the battery What to do nextRemoving and replacing an optical drive Installing security features Removing and replacing a diskette driveIdentifying security locks Integrated security cableUser Guide Rope clip Password protectionTo install a rope clip Cover lockErasing a lost or forgotten password clearing Cmos Closing the cover and connecting the cablesViewing and changing settings Using the IBM Setup UtilityStarting the IBM Setup Utility program Exiting from the IBM Setup Utility programAdministrator Password Password considerationsUser Password IDE Drive User PasswordUsing Security Profile by Device IDE Drive Master PasswordSetting, changing, and deleting a password Select Security Profile by DeviceSelecting a temporary startup device Advanced settingsSelecting a startup device Changing the startup device sequenceUpdating flashing Bios from your operating system Appendix A. Updating POST/BIOSUpdating flashing Bios from a diskette Recovering from a POST/BIOS update failure Cleaning a mouse with a ball Appendix B. Cleaning the mouseCleaning an optical mouse User Guide Appendix C. Manual modem commands Basic AT commandsSet Tone Dial as default Low speaker volumeSet Pulse dial as default Internal speaker on until carrier detectedExtended AT commands MNP/V.42/V.42bis/V.44 commands Fax Class 1 commands Fax Class 2 commandsVoice commands Appendix C. Manual modem commands User Guide Appendix D. Notices Trademarks IBMIndex Special characters Page Page Part Number 19R0474
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