I'm just wondering on why site that is already indexed don't display any backlinks in major search engine even I do posting to forums with signature.

If you're saying you don't get on search result pages, then wait a little more till the search engine updates the db. If you're intending that you have search engine listing but still not showing in some backlink tool, then the tool may be wrong.

Anyway, give it time. I didn't actually get the question. So, please add some more details.

I think you should check it in yahoo. Yahoo is best for checking backlinks. Google updates them once in a while and shows only quality ones.

If this is your url http://www.tvaddicts.tv/
then you have 742 backlinks
Check this http://siteexplorer.search.yahoo.com...&fr2=seo-rd-se

You have no backlinks with google. I think you have to wait. I suggest you make linkexchange.

Google is very lazy when it comes to page rank and backlinks. As suggested the best way to check your backlinks is yahoo.com just type in your domain like "theseokit.com" Enjoy!