Try these and if you still face any issue in the coming days do let me know. I understand these are basic things which you would have done. But give it a try one more time and do update me please.Please try clearing the browser cache and then access the site. Below given link will guide you through the same process:
Clear your web browser's cache, cookies, and history
Next I request you to try flush your local DNS. Please try rebooting the router as well, if any.