Pagerank Problems

My blog does not have any pagerank anymore. It used to have one pagerank but now it has none. What should I have to do?

Your PageRank entirely depends on the amount of and quality of the backlinks that you have, most people (i too) think that it has something to with the content or the SEO, but it doesn't.

You have probably lost some of your backlinks or you have built some link exchanges that Google terms as "illegal" to their TOS. If you create a link exchange (link wheel or whatever you want to call it) on another site and that site has a link to your site, the crawler goes from your site onto their site and on that site, if the crawler finds a link back to your site, then your pagerank decreases.

But don't worry, you can get more links and your site can get back to your original PR and maybe even higher. They get updated every 3 months, so you have plenty of time

Check these tutorials and tips -

5 Steps to Increase your Google Page Rank.
How We Got a Page Rank 5 in Two Months
How to Increase Google PageRank

And a PageRank Prediction tool!

Don't bother about pagerank much as it doesn't influence the result page much. If you are still interested in pagerank then check some external sites from wikipedia article. SEBook and SEOMoz are two other good sites where you can read more about pagerank. SEOmoz has tons of material related to pagerank and search engine optimization. Hope this helps.