Problems with master password

[tg_barros]

I have a mac 10.4.5, and in the system preferences on the security menu
appears that i have a master password set for this computer.
And i don´t know the password.
How can i reset or change this password, without knowing the old one.
And i already try the password login of the administrator.
Can someone help me with this ptoblem.

 

[Cheryl]

The master password is a computer-wide password set up by an administrator as a safeguard in case the administrator forgets his or her login password. The master password is usually used in conjunction with FileVault, a way of encrypting a user's home folder so it can't be seen by anyone but that user. If a FileVault user forgets his or her login password, even an administrator can't log in to the user's account with an administrator password. Only the master password can override a FileVault user's password.

Check Keychain Access >System to see if the master password has been saved there.

 

[billbaloney]

Did you try a blank password? Any other password that you know? Did you buy the machine used or pre-configured from somewhere? Did someone else install or configure the operating system for you?