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My computer chair jammed; how do I un-jam it?

I'll be honest, I've no clue how it happened. It was working fine about two, three hours ago. But, for some reason, my chair remains in the reclined position, even when I'm not in the chair. I'd rather not sit on the edge of the chair forever; if anyone may have an idea of how to un-jam this thing, please.. I need some help.
Chairman, January 2009