When you do that and you add a little gas pedal to it, what happens?
Next time that happens try to turn the key back and then into position again and the release the clutch again. It sounds like either your not getting any fuel or not getting any spark...no fuel is the first thing that comes to mind though, but I don't know, unless you don't actually have the key in the right position, why you wouldn't be getting any fuel though.
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