Henry hoover - occasionally it won't **** and I can usually sort it out. This time it just won't **** anything up.

Hi, Have you checked the hose for blockages and also the only main problem with these are you know when you take the top off then their is that big round filter that sits on the lip that holds the two parts together, Check this is in the correct way and that the seal is not damged check also the clips holding the top and bottom together are secure.
But blow down hose make sure not blocked then check the filter this might even need banging to remove dust in case its built up to much and not allowing the air to get through it ok
Let me know how you get on ok