Lenovo TC A51-8428, TC A51-8425, TC A51-8424 manual Recovering from a POST/BIOS update failure

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6.Scroll down and look for a .txt file that has instructions for Flash BIOS update from the operating system. Click the .txt file.

7.Print these instructions. This is very important since they are not on the screen after the download begins.

8.From your browser, Click Back to return to the list of files. Carefully follow the printed instructions to download, extract, and install the update.

Recovering from a POST/BIOS update failure

If power to your computer is interrupted while POST/BIOS is being updated (flash update), your computer might not restart correctly. If this happens, perform the following procedure commonly called Boot-block Recovery.

1.Turn off the computer and any attached devices, such as printers, monitors, and external drives.

2.Unplug all power cords from electrical outlets, and open the cover. See “Opening the cover” on page 12.

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

4.If necessary, refer to “Accessing system board components and drives” on page 14 to gain access to the Clear CMOS/BIOS Recovery jumper.

5.Remove any cables or adapters that impede access to the Clear CMOS/BIOS Recovery jumper.

6.Move the jumper from the standard position (pins 1 and 2) to pins 2 and 3.

7.Replace any cables or adapters that were removed.

8.Close the cover. See “Closing the cover and connecting the cables” on page 24.

9.Reconnect the power cords for the computer and monitor to electrical outlets.

10.Insert the POST/BIOS update (flash) diskette into drive A, and turn on the computer and the monitor.

11.During the update session there will be no video. You will hear a long beep when recovery is completed. Remove the diskette from the diskette drive, and turn off the computer and monitor.

12.Unplug the power cords from electrical outlets.

13.Open the cover. See “Opening the cover” on page 12.

14.Remove any cables or adapters that impede access to the Clear CMOS/BIOS Recovery jumper.

15.Replace the Clear CMOS/BIOS Recovery jumper to its original position.

16.Replace any cables or adapters that were removed.

17.Close the cover and reconnect any cables that were disconnected.

18.Turn on the computer to restart the operating system.

30User 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 Input/output features PowerSecurity features 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 Password protection To install a rope clipRope clip Cover lockErasing a lost or forgotten password clearing Cmos Closing the cover and connecting the cablesUsing the IBM Setup Utility Starting the IBM Setup Utility programViewing and changing settings Exiting from the IBM Setup Utility programPassword considerations User PasswordAdministrator Password IDE Drive User PasswordIDE Drive Master Password Setting, changing, and deleting a passwordUsing Security Profile by Device Select Security Profile by DeviceAdvanced settings Selecting a startup deviceSelecting a temporary 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 commandsLow speaker volume Set Pulse dial as defaultSet Tone 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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