Suddenly my website front page was not found! My websites richtown.ae, and hannahaicah.com suddenly are not showing the front page; the rest of the pages is working fine. My hosting provider changed the php.ini file this morning, due to problems with PDO. Can anybody tell me what happened?

I also changed the path for the front page but nothing happened.
Edit your .htaccess and the setup of your subdomain.richtown.ae...
frontpage on a subdomain?

# If your site can be accessed both with and without the 'www.' prefix, you
# can use one of the following settings to redirect users to your preferred
# URL, either WITH or WITHOUT the 'www.' prefix. Choose ONLY one option:
#
# To redirect all users to access the site WITH the 'www.' prefix,
# (http://example.com/... will be redirected to http://www.example.com/...)
# uncomment the following:
# RewriteCond %{HTTP_HOST} !^www\. [NC]
# RewriteRule ^ http://www.%{HTTP_HOST}%{REQUEST_URI} [L,R=301]
#
# To redirect all users to access the site WITHOUT the 'www.' prefix,
# (http://www.example.com/... will be redirected to http://example.com/...)
# uncomment the following:
# RewriteCond %{HTTP_HOST} ^www\.(.+)$ [NC]
# RewriteRule ^ http://%1%{REQUEST_URI} [L,R=301]