Code to remove default WordPress page meta boxes. Add to functions.php file. Taken from http://wpmu.org/remove-wordpress-meta-boxes/

Remove WP Page Meta Boxes

// REMOVE PAGE META BOXES
function remove_my_page_metaboxes() {
remove_meta_box( 'postcustom','page','normal' ); // Custom Fields Metabox
remove_meta_box( 'postexcerpt','page','normal' ); // Excerpt Metabox
remove_meta_box( 'commentstatusdiv','page','normal' ); // Comments Status Metabox
remove_meta_box( 'commentsdiv', 'page','normal' ); // Comments Metabox
remove_meta_box( 'trackbacksdiv','page','normal' ); // Talkback Metabox
remove_meta_box( 'slugdiv','page','normal' ); // Slug Metabox
remove_meta_box( 'authordiv','page','normal' ); // Author Metabox
}
add_action('admin_menu','remove_my_page_metaboxes');