Our website has been fully functional up until recently when all of a sudden (no update made to WP version and/or any plugins) when we browse to /wp-admin the page is black. We have followed many of the suggestions elsewhere here (like renaming Plugins Folder, checking for spaces in functions.php, uploading a new wp-login.php etc) none of which have worked. Its very confusing as we didnt update anything and were able to login recently without any issue. All help and advice greatly appreciated. The site is up and running here at http://www.leanunlimited.com
We can FTP of course, but no WP access and need to make an urgent edit to the site so thanks in advance folks.