Most computers that are connected to the Internet do what is called DNS caching. This means that domain names and web addresses of the websites you visit are stored so that when you visit a page more than once, it can load faster because it has been cached. DNS is updated on a regular basis, but not always when you need a new copy of the DNS. This can present problems if your website has moved, but your the DNS on your computer is old. In that case, you'll need to Flush the DNS on your computer to force a fresh copy of DNS to be loaded.
Click on the link below and follow the steps to flush DNS in either Microsoft Windows or Mac operating systems.