Godaddy htaccess Internal Server Error

[eluser]onikage997[/eluser]
after a few debugs, I found something weird in my Model:

Code:

function get_byTopicTitle()
    {
        if($this->uri->segment(1) == "")
        {
            $this->db->where('topicURLTitle', "index.html");
        }
        else
        {
            $this->db->where('topicURLTitle', $this->uri->segment(1));
        }
        $this->db->limit(1);

        $query = $this->db->get('tbltopics');
        //return $query->result();
        return $query;
    }

The $this->uri->segment(1); is not returning anything even though the URL is http://www.my-domain.com/benefits-of-something.html
It suppose to return "benefits-of-something.html" but it didn't so it always show my index page..

It seems that $_SERVER['ORIG_PATH_INFO'] is not working in goDaddy and $_SERVER['PATH_INFO'] only returns /

Any ideas?

Many Thanks..