Currently Being ModeratedFeb 27, 2013 6:18 PM (in response to JArlindo)
What Mac OS X? 10.6, startup on the install disk, holding the C key, language, etc., then from menu bar select Utilities and reset password. 10.7, startup on recovery HD and similar. 10.8, startup on recovery HD but more difficult, from Utilities open Terminal window and from there type reset password and answer the user when prompted.