I just got an iMac and I wanted my display name to be the same as "My name" so I right clicked on My Account under the Accounts section and just took the name out so it was nothing. Now I try to click the lock to make changes and my name is not in the login box by default now and when I type my name in and my password it doesn't accept it. None of this happened until I took the name out of advanced on my user account... I am brand new to OS X and very confused... Thanks in advance.