eckul on "older posts link not working"

Hi, my older posts link is not working. I've seen a few other topics similar to this but nothing has helped. When I click the link it just loads the same posts, I'm guessing I need to add something to my loop. I'm not excluding any categories so I'm not sure whats going wrong. please see below code, any help would be great. Cheers

<?php if ( have_posts() ) :
						twentyeleven_content_nav( 'nav-above' ); 

						while ( have_posts() ) : the_post();
							get_template_part( 'content', get_post_format() );
						endwhile; 

						twentyeleven_content_nav( 'nav-below' );
					else :
				?>
				<article id="post-0" class="post no-results not-found">
					<header class="entry-header">
						<h1 class="entry-title"><?php _e( 'Nothing Found', 'twentyeleven' ); ?></h1>
					</header><!-- .entry-header -->

					<div class="entry-content">
						<p><?php _e( 'Apologies, but no results were found for the requested archive. Perhaps searching will help find a related post.', 'twentyeleven' ); ?></p>
						<?php get_search_form(); ?>
					</div><!-- .entry-content -->
				</article><!-- #post-0 -->
			<?php
				endif;
			?>