All WP blog pages suddently won’t display

Hello,
My blog suddenly won’t display at all. I can link to static pages (HTML or image files) inside the blog’s directory, but any PHP file (home page, specific posts, login file) results in a blank page in Firefox (or “The page cannot be displayed” error in IE).

I haven’t made any changes to the blog since I upgraded to 2.3.3 a few weeks ago. So far, the support at Dreamhost has been not helpful. The tech suggested that I move all of the plugins and themes (save for default) to a new directory, assuming that one of them is corrupting something. I can get the version of my blog that was saved when I upgraded to 2.3.3 to at least come up, though it has plenty of errors.

Any help? This is especially odd to me given that I haven’t changed anything, and haven’t even posted in a few days.

The blog is at:
https://www.pike27.net/rfn/

You can see the backed-up version at least display at https://www.pike27.net/rfn.old/

Thanks!
dp