From the php-documentation:
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The function mysql_create_db() is deprecated. It is preferable to use mysql_query() to is-sue a sql CREATE DATABASE statement instead.
Note: This function will not be available if the MySQL extension was built against a MySQL 4.x client library.
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Line 63 of mysql.inc.php must be changed to
mysql_query('CREATE DATABASE ' . $cfg['mysql_db']) or message('error', '<strong>Can\'t create database:</strong><br>' . $cfg['mysql_db']);
Otherwise the DB can't be created, the script fails and only a white page (with the headers) will be shown (no login, no other functions...).
hth
Felix