500 Internal Server Error
A: If you have implemented the .htaccess on your site, it may be interfering with the web page you are trying to load into your browser.
You can try removing following part of code from the .htaccess file:
Options All –Indexes
ErrorDocument 404 /404.php
FileETag MTime Size
Options All – Indexes enables all features on your webserver except Indexes (for reference see http://httpd.apache.org/docs/1.3/mod/core.html#options)
ErrorDocument 404/404.php defines the page that will be displayed for missing files (for reference see http://www.javascriptkit.com/howto/htaccess2.shtml)
FileETag MTime Size defines that FileETag response header field will be created using MTime (time and date when it was modified) and Size (the number of bytes included in the file) (for reference see http://httpd.apache.org/docs/1.3/mod/core.html#fileetag)
If the issue still persists remove or rename the .htaccess file and try to run the page again. If the page loads properly after that, you will need to check server settings with your server administrator.

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