Following all seo measures still Google isnt indexing

I have 100% unique content some good backlinks and have made other seo measures which usually a person should follow still my site is no where in search results despite the fact i copy a paragraph from it and make a search in Google my site is no where to be found.

Seems google is completely ignoring my site what could be the problem, webmaster tool says nothing. I have had 300% decrease in traffic since last 3-4 months please help me i am confused

 

So you were indexed and now you're not?

If you got deindexed then your site is pretty much screwed.

On the other hand if it's a new site that's never been indexed then start building a few links and it should get indexed rather quickly.

 

My experience says that Google does not ignore sites with good unique content. So, I guess the question I have is, "How are you defining '100% unique content'?"

 

have you gone through google webmaster tools? If not, try it. so that you can see your website's status such as pages indexed, links to your site, impression your site getting in the search results etc etc.

 

I checked the webmaster tools found some 404 errors on pages which are no where in the sitemap and actually dont exist. Apart from that may be the site speed could be the problem

Submitted URLs 2,978
2,966 URLs in web index

Could speed be the problem as shown here because of server change i shifted from dreamhost to hostgator recently

 

I don't think your site (if it the one, whose link has been provided in your response above) is de-indexed. check here

http://goo.gl/jJoKr

Code (markup):

 

the links which i am adding are no where to be found their rankings seems to have degraded even before posting could this be related to seo plugin (all in one seo in this case)

 

Could this code be the problem adding canonical on each and every page can this be the problem

<link rel='canonical' href='http://mywebsite.com/games/most-awaited-games-of-2012-10-most-anticipated-games.html' />

Code (markup):