Have you changed anything in .htaccess folder of on your server?
No ! @Tushar_Ramani
Any changes doen through FTP?
Nothing I changed in my Hosting cpanel....
You need to contact your hosting provider to fix problem because problem are with your.htaccess folder on your server.
Yes ! I think it would definitely work
Did you modify anything in the theme/plugins, or may be some custom CSS?
No. I didnt modified anything...Now its almost 40 hrs, the problem still the same
Where have you hosted your website? I mean on which host? You can go into the cPanel and have a look at the error log. Check the errors generated within the last 50-60 hours. You shall definitely find something there, and if you still don't then make a call to the hosting support.
Hostgator India... Al right... I'm going to check it now.... Thank you @Dhananjay
Thank you @Dhananjay_Bhardwaj The problem is fixed now
Glad to hear that. What was it? Some sort of server-side issue?
Defect on one plugin @Dhananjay_Bhardwaj
One of the major cause. That's why whenever I face an issue with the website, the first thing I do is disable all the plugins. This lets me rule out any possibility, if the problem was generated due to the plugins.
All the best for further.