Not appearing on search results

I had migrated my website from Joommla to WordPress. So I had removed the entire website from Google and thought it would re-appear with the new URLs.
But unfortunately, there’s absolutely no trace of my website on Google, Yahoo or Bing. I have set my robots.txt file to allow all directories and also, I have set WordPress to allow visitors as well as search engines in my Privacy settings.
Will there be anything wrong in my WordPress installation?
I did post in Google’s forum, but as usual, nobody has replied.

I’m too worried and need some suggestions please.