THE PROBLEM:
I have changed *something* !(?) and my home page now looks like this. [EDIT: the page has been fixed, here's what it looked like:

All that's left is the menu bar and one category/page?! Whilst the posts are still there ('edit' shows the content is there), when I click on 'preview', I get the screen above!
POSSIBLE CULPRITS:
The only other thing I changed was that I recall making a new page called 'home' (trying to make the front page static, and following a tutorial), and at one point I changed Settings->Reading-> Front page displays to 'static post' - and I fear (newbie guesswork) this may have deleted the previous atahualpa 'home' page (the one with the header, info etc etc ). In the admin panel I can see the posts are still there, and everything seems normal - EXCEPT that in Settings-> General, the 'site title' and 'tagline' fields are now blank...
I also remember deleting some unused pages earlier, but I don't recall 'home' being one of them.
WHAT I HAVE DONE SO FAR TO TRY TO FIX:
I tried restoring the deleted pages them from trash, but it made no difference.
I tried tools->import-> wordpress; and importing a recent save (xml file), but it made no difference. I'm new to WP, atahualpa, and php, and don't know what to do!
DID I SEARCH THROUGH BYTESFORALL, AND THE FAQS?
Yes, I did, but most similar problems were either related to an atahualpa update, or the persons page was completely blank; mine is not blank, the menu is bar there, with the sole 'home' category.
please advise
thanks
Andrew K
ps. FWIW: I'm using:
WordPress 3.0.5
Atahualpa 3.4.9
Plug ins:
Categories to Tags Converter Importer
Hello Dolly
Menu Manager
Thumbnail For Excerpts
WordPress Importer
WP Post Thumbnail