HELP!!!!! WordPress not working at ALL!!!!!!!!

Fatal error: Call to undefined function: require_wp_db() in /home/content/d/i/s/discninja/html/wordpress/wp-settings.php on line 250

This would normally mean you did not get all the files correctly put on the server.

Why would it work initially if the files were not correctly put into the computer?

I am willing to bet it nerver worked correctly. But, in any event . . .

Your blog is apparently here, http://www.discninja.com/blog/ not here, discninja.com/wordpress as you say above, which result in a 404.

You installed WP in the root directory along with the http://www.discninja.com html website. That is why if you go to http://www.discninja.com you get a site and if you go to discninja.com/index.php you get a database error.

I will bottom line it for you. You need to first delete the wp files you have (not your wp-content files if you have made changes to theme or css). Then decide which directory you want to install wp. Create that directory and ftp the wp files there. Install WP following instructions here, http://codex.wordpress.org/Installing_WordPress