Check to make sure your hose isn't clogged. I know with my vacuum I changed the filter and everything, and it wouldn't suck nothing up, then I remembered the hose, I unscrewed that and MY GOODNESS, hair ball for days, I thought it would never end, dust, fur, hair balls, cat fur, goodness. So check that out, if that do not work, just remove the bag and try again from the beginning making sure your connections are tight.