Acer Altos R910 - Manual (Page 133)

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To set a Administrator/User password
1 Use the up/down keys to highlight a password parameter (Set
Administrator Password or Set User Password) then press Enter.
A password box will appear.
2 Type a password then press Enter.
The password may consist of up to seven alphanumeric characters
(A-Z, a-z, 0-9).
3 Retype the password to verify the first entry then press Enter
again.
After setting the password, the system automatically sets the
chosen password parameter to Installed.
To change the Administrator/User password
1 Use the up/down keys to highlight either change password
parameters (Change Administrator Password or Change User
Password) then press Enter.
2 Type the original password then press Enter.
3 Type a new password then press Enter.
4 Retype the password to verify the first entry then press Enter
again.
To remove the User password
1 Use the up/down keys to highlight the Clear User Password
parameter then press Enter.
2 Enter the current password then press Enter.
3 Press Enter twice without entering anything in the new and
confirm password fields.
After doing this, the system automatically sets the User password
parameter to Not Installed.