Query posts only if meta_value is not empty

Try removing they value from your meta query:

$args = array(
    'orderby'        => 'display_name',
    'meta_query'     => array(
        array(
            'key'     => 'member',
            'compare' => '!=',
        ),
    ),
);

$users = get_users($args);

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)