My DC07 was doing the same thing. No clogs but wouldn't suck from the floor, only the hose. I read an entry from someone who wrote that if the belt/brush mechanism is off even a milimeter, it won't suck. True. I had taken the brush out to remove hair and debris and put it back in wrong. It's a pain but you have to get it in just right and voila! It will go back to picking up!
Lesley, June 2008