Display posts from single category on blog page template

Hello I need to display posts from a single category (category ID=5) on our theme’s ‘page with blog page template'(page-blog.php). This is the code used for the template:

<?php
/**
* Template Name: Page with Blog
**/
?>
<?php get_template_part('system','header');?>
	<!--CONTENT-->
		<div class="content">
			<?php if (have_posts()) : ?>
			<div class="breadcrumbs style-2">
<p style="text-indent: 5em;">				<?php echo __('&nbsp;You are here:','xceleron');?> <?php if (function_exists('dimox_breadcrumbs')) dimox_breadcrumbs(); ?>
				<div class="t-social">
					<?php if(of_get_option("facebook_link")!=null): ?><a href="<?php echo of_get_option("facebook_link");?>" class="fb"><img src="<?php bloginfo('template_directory');?>/img/fb-small.png" alt=""/><?php echo __('Like','xceleron');?></a><?php endif;?>
					<?php if(of_get_option("twitter_link")!=null): ?><a href="<?php echo of_get_option("twitter_link");?>"><img src="<?php bloginfo('template_directory');?>/img/twitter-small.png" alt=""/><?php echo __('Follow us','xceleron');?></a><?php endif;?>
					<a href="<?php get_bloginfo('rss2_url');?>"><img src="<?php bloginfo('template_directory');?>/img/rss-small.png" alt=""/><?php echo __('RSS feed','xceleron');?></a>
				</div>
			</div>
			<?php endif; ?>
			<div class="hAlign clearfix">
				<div class="l-content">
					<?php
						if (have_posts()) :
						while (have_posts()) : the_post();
					?>
					<?php the_content();?>
					<?php echo do_shortcode('[blog]'); ?>
					<?php endwhile;endif; ?>
				</div>
				<div class="sidebar">
					<?php if ( !function_exists('dynamic_sidebar') || !dynamic_sidebar("BlOG SIDEBAR") ) : endif; ?>
				</div>
			</div>

		</div>
	</div>
	<!--END CONTENT-->
<?php get_footer(); ?>