Worpress tweaking theme problem

Hoping someone can tell me what i done wrong and how to fix it you see I was tweaking my wordpress theme just doing 1 tweak at a time like adding meta tags in theme header, adding favicon image everything going well then all of a sudden I load my wordpress site home page loads then when I went to go another page disaster all I can get for all the other pages is this code
<?php
/**
* Front to the WordPress application. This file doesn't do anything, but loads
* wp-blog-header.php which does and tells WordPress to load the theme.
*
* @package WordPress
*/

/**
* Tells WordPress to load the WordPress theme and output it.
*
* @var bool
*/
define( 'WP_USE_THEMES', true );

/** Loads the WordPress Environment and Template */
require( dirname( __FILE__ ) . '/wp-blog-header.php' );
it happened just after editing each page by adding background image but each page loaded fine until I finished and just went to view the site normally and it then when I got this code displaying except on home page and so far I've gone back through the theme removing or adding edits still no luck so totally baffled I decided to delete theme files on server and then re-install theme again and still no luck I am desperately needing to fix this problem as it is my business site and I can't offer my services when my site is corrupt so please anyone has an idea how to fix issue please do get in touch