I have set up many wordpress installs for myself and other people but today I have tried to set up a testing install on a directory off one of my sites. I have managed to install WordPress and use the dashboard and write posts but when i go to preview or view site it just shows up as a white blank screen. When I try to preview themes or posts this happens too! When I type in the web address this happens too but I can manage to get to the login screen though if I add /wp-admin to the address. I am completely baffled because I don't know if this is a wordpress problem,hosting problem, browser problem or MySQL problem.
I am using a 1and1 MySQL database and hosting which I have been using for years but have never experienced this problem before.