Empty till you can see opening to make sure there ain't a log jam
Agreed, single most common problem I've had is something in the feed--even a small piece of paper-that is blocking the outlet from the hopper.
If that is not it, it could be the small motor that spins the plate that agitates the food right below the hopper, dropping it into the throwing chamber. You can check this easily by opening the side of the feeder, and removing the clear plastic panel that covers the "innards" of the feeder, then activating the feeder and seeing if that motor spins. It might be possible to see that though the clear plastic, but there has been too much feed dust in my feeder to see through clearly. If necessary, that small motor can be easily replaced.
