Home page URL disappears in Google after switching to WordPress

[johnzhel]

It was a 10 page static HTML page website. 3 year old, PR2.

Monday night, copied a WordPress from somewhere to this website's public_html folder and activate it.

The home page was "index.html" before switching to WordPress. Now this html file (index.html) has been deleted, so WordPress' Home page can work.

All other 9 static html pages are still there in Google index.

Just notice it today that the home page URL disappears in Google completely. Why?

All other 9 static html pages' URL are still in Google.

robots.txt is Allow: /

What may have gone wrong to remove the home domain URL from Google index?

Thank you for your help!

[irvingw]

The Homepage URL disappeared because you deleted the file so it no longer exists.

Redirect the old index.html URL to the new wordpress homepage URL using modrewrite in HTACCESS. You need to do that to pass the homepage PR2 pagerank juice to the new homepage URL or you're throwing the PR away and most sites homepage is the one with the highest PR.