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Forum Moderators: rogerd
How do you prime the pump?
If people aren't joining in, see if you have any barriers to posting. For example, if you require registration to post perhaps you could enable guest posting (no registration) for a short time to stimulate posting.
If there's a near-total absence of discussion going on, that in itself could be an inhibitor. Consider asking a few friends to post replies to get the ball rolling. (If you are truly desperate, adopt an alter ego and disagree with yourself. ;))
Check the Community Building Library [webmasterworld.com] for ideas on how to jump-start a forum and how to turn lurkers into posters. Good luck, Henry.