Dell Precision T5400 (Late 2007) - Manual (Page 84)

84 Securing Your Computer
A change to Admin Password becomes effective immediately (no need to
restart the computer).
Operating Your Computer With an Administrator Password Enabled
When you enter the system setup program (see "System Setup" on page 89), the
Unlock Setup option is displayed.
If you do not type the correct administrator password into the
Unlock Setup
field, the computer lets you view, but not modify, system setup options.
NOTE: You can use Password Changes in conjunction with Admin Password to
protect the system password from unauthorized changes.
Deleting or Changing an Existing Administrator Password
To change an existing administrator password, you must know the administrator
password. To escape from the field without assigning a system password, press
at any time before you complete step 5.
1 Enter the system setup program (see "System Setup" on page 89).
2 Use the arrow keys to navigate to the Admin Password field, and then press
.
3 Type your password into the Old Password field.
4 If you are changing an existing password, follow the instructions in
"Assigning an Administrator Password" on page 83, starting from step 4.
5 If you are deleting a password, press in New Password field,
leaving the field blank.
6 Press a second time, in the Confirm New Password field, leaving
the field blank.
7 Confirm that Not Set is displayed for the Admin Password setting.
If Not Set is displayed, the administrator password has been deleted. If
Not Set is not displayed, then repeat step 3 through step 8.
8 Exit system setup.
Disabling a Forgotten Password and Setting a New Password
To reset system and/or administrator passwords, see "Trusted Platform Module
(TPM)" on page 85.