I have a personal blog flyillusions.com where I post sporadically, but have had for three years without problems. After a couple month hiatus I visited the site only to find the front page loads fine, but clicking on any post or link yields:
The requested URL /category/bench-tools/ was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
I could not log in as admin, I got the WSoD. flyillusions.com/login.php got the login screen, but typing in the info again got the WSoD.
After googling this, I renamed the themes through ftp except for 2010. Even the front page didn't work then.
I don't know php, but looking at the files, I didn't see any obvious spaces, but I'm not sure I would know them if they were present.
I had a link to a comment in my email. Clicking that took me to the admin page. Then I was able to retest the themes - no change.
I updated to wp 3.5 from 3.4.2, thinking maybe my installation was corrupted. No change.
I don't know anything about databases or how to check them.
Any suggestions of what to do from here would be very much appreciated.