Lenovo ThinkCentre M55 Hardware Maintenance Manual - Page 381
Additional Service Information, Security features, Hardware controlled Passwords
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Chapter 9. Additional Service Information This chapter provides additional information that the service representative might find helpful. Security features Security features in this section include the following: • Passwords • Vital Product Data • Alert on LAN™ Hardware controlled Passwords Hardware controlled passwords are set using the Setup Utility program. For more information about passwords, see "Using passwords" on page 47. Operating system password An operating system password is very similar to a power-on password and denies access to the computer by an unauthorized user when the password is activated. The computer is unusable until the password is entered and recognized by the computer. Vital product data Each computer has a unique Vital Product Data (VPD) code stored in the nonvolatile memory on the system board. After you replace the system board, the VPD must be updated. To update the VPD, see "Flash update procedures" on page 375. BIOS levels An incorrect level of BIOS can cause false errors and unnecessary FRU replacement. Use the following information to determine the current level of BIOS installed in the computer, the latest BIOS available for the computer, and where to obtain the latest level of BIOS. • Current Level BIOS information - Run the Setup Utility to determine the level of BIOS installed. • Sources for obtaining the latest level BIOS available 1. Lenovo support web site: http://www.lenovo.com/think/support/ 2. Lenovo Customer Support Center 3. Levels 1 and 2 Support To update (flash) the BIOS, see "Flash update procedures" on page 375. Flash update procedures This section details how to flash (update) the BIOS. © Copyright Lenovo 2008, 2010 375