Can't output an image
You would usually display the image with 

{% for pageImage in entry.pageImage %}
    &lt;img src="{{ pageImage.getUrl() }}"&gt; 
{% endfor %}


But this only works if you enabled the public url option for the asset source. There is a light switch if those assets should have urls or not in your cp

It also has a getImg() function

/**
 * Returns an &lt;img&gt; tag based on this asset.
 *
 * @return \Twig_Markup|null
 */
public function getImg()
{
    if ($this-&gt;kind == 'image' &amp;&amp; $this-&gt;getHasUrls())
    {
        $img = '&lt;img src="'.$this-&gt;getUrl().'" width="'.$this-&gt;getWidth().'" height="'.$this-&gt;getHeight().'" alt="'.HtmlHelper::encode($this-&gt;title).'" /&gt;';
        return TemplateHelper::getRaw($img);
    }
}