How can you get your Page Rank back?

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Hi everyone, I got sad when I found out the my blog's page rank became 0, when I had it for months as 2. I don't know how it happened, but I'm a little devastated. Anyway, is there a way where can I get it back by posting more articles? Or is it just gone forever? For those blog-owners who experienced the same, were you able to get your PR back? Just wonderin'..Need more information on this one.. Also how do they compute pageranks? how can I get a 10??