It was working yesterday. Now all I get when I when I go to the site is a blank page. The favicon still shows on the address bar and the file structure looks fine on the server control panel.

Can I hack the commands and get access?

Start here

Thanks, I have bookmarked that page in case it happens again.

For the sake of others in the same position. By the time I had left here all of my sites containing forums, Galleries etc were showing blank pages so I suspect something changed on the server.

Went offline for a couple of hours and the whole lot were back and working when I returned. I have asked the hosts what happened or if they were working on anything but no answer yet. Possibly another one of those things I should know but haven't figured out yet.

Thanks again