Lenovo Thinkpad L570, Руководство по техническому обслуживанию аппаратной части

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5. Click Troubleshoot to display optional recovery solutions.
6. Select a corresponding recovery solution according to your situation. Then follow the instructions on
the screen to complete the process.
Passwords
As many as three passwords might be needed for any ThinkPad notebook computer: the power-on
password, the hard disk password, and the supervisor password.
If any of these passwords has been set, a prompt for it appears 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 installed, the password prompt does not appear when the operating
system is booted.
Power-on password
A power-on password protects the system from being powered on by an unauthorized person. The
password must be entered before an operating system can be booted. For how to remove the power-on
password, see “How to remove the power-on password” on page 40.
Hard-disk password
There are two hard-disk passwords:
• User hard disk password - for the user
• Master hard disk password - for the system administrator, who can use it to get access to the hard disk
even if the user has changed the user hard disk password
Note: There are two modes for the hard disk password: User only and User . The User
mode requires two hard disk passwords; the system administrator enters both in the same operation. The
system administrator then provides the user hard disk password to the system user.
Attention: If the user hard disk password has been forgotten, check whether a master hard disk password
has been set. If it has, it can be used for access to the hard disk drive. If no master hard disk password is
available, neither Lenovo nor Lenovo authorized service technicians provide any services to reset either the
user or the master hard disk password, or to recover data from the hard disk drive. To put the system back
to operational status, the only Lenovo and Lenovo-authorized service solution would be to replace the hard
disk drive or solid-state drive with a scheduled fee.
For how to remove the power-on password, see “How to remove the hard-disk password” on page 41.
Supervisor password
A supervisor password protects the system information stored in the BIOS Setup Utility. The user must enter
the supervisor password in order to get access to ThinkPad Setup and change the system configuration.
Attention: If the supervisor password has been forgotten and cannot be made available to the service
technician, there is no service procedure to reset the password. The system board must be replaced for
a scheduled fee.
How to remove the power-on password
To remove a power-on password that you have forgotten, do the following:
(A) If no supervisor password has been set:
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L570 Hardware Maintenance Manual