Lenovo 21BX001LGE, Руководство по техническому обслуживанию аппаратной части

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Chapter 4. Related service information
This chapter presents following information:
• “Reset or restore Windows” on page 27
• “Passwords” on page 27
• “Power management” on page 29
• “Symptom-to-FRU index” on page 30
Service Web site:
When the latest maintenance diskette and the system program service diskette become available, they will
be posted on:
https://support.lenovo.com
Reset or restore Windows
To reset or restore Windows, refer to the information below ：
• Use Lenovo recovery options.
1. Go to
https://support.lenovo.com/HowToCreateLenovoRecovery
.
2. Follow the on-screen instructions.
• Use Window recovery options.
1. Go to
https://pcsupport.lenovo.com
.
2. Detect your computer or manually select your computer model.
3. Click Diagnostics ➙ Operating system Diagnostics and then follow the on-screen instructions.
Passwords
You can set a power-on password, supervisor password, or system management password in UEFI BIOS to
prevent unauthorized access to your computer.
If any of these passwords has been set, a prompt for it will be displayed on the screen whenever the
computer is turned on. The computer does not start until the password is entered.
Note: If only a supervisor password is set, the password prompt will not be displayed when the operating
system is started.
Power-on password
A power-on password protects the system from being turned on by an unauthorized person. The password
must be entered before the operating system can be started. For instructions on how to remove the power-
on password, see “How to remove the power-on password” on page 28.
Supervisor password
The supervisor password protects the system information stored in UEFI BIOS. It provides the following
security features:
• If only a supervisor password is set, a password prompt is displayed when you try to enter the UEFI BIOS
menu. Unauthorized users cannot change most of the system configuration options in the UEFI BIOS
menu without the password.
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