Forgot mysql owner/root username and password
You have a variety of options to reset the password http://code.openark.org/blog/mysql/recovering-a-mysql-root-password-the-fourth-solution

UPD:
Following the Max's advice let me elaborate. The easiest way to reset any password is to restart MySQL with skip-grant-tables in my.cnf. Then MySQL won't ask the password. To set new password execute this:

 mysql -e "UPDATE mysql.user SET password = PASSWORD('newpassword') WHERE user = 'root' and host = '&lt;host&gt;'"


where &lt;host&gt; is host where user connects form.

Then restart MySQL again, but without skip-grant-tables option.