Hi thanks for the advice.
I have checked htaccess and nothing has been changed within it.
I have not added any other plugins (The site was loaded from your quickstart files only)
Also the server config has not changed since installation, its on a dedicated server.
The last thing I did when everything stopped working was remove the Blog item from the main menu as it wasnt required.
Since that moment the site has not worked.
I opened a ticket with the server host and they tell me its a site issue and to contact the provider of the template!
Any help really would be appreciated as I had basically finished the site and to start again would cost me hours and hours of work.
Daz