The problem is the trash ram is pushing down on the edge of the metal of the trash compartment because the door is partially open. The solution is to back-up the ram the the door will close.

To back-up the ram, you will need to pull the compactor out from under your cabinets and unplug it. Turn the compactor on it's side to expose the bottom. There is a plate on the bottom that covers the motor gears. Remove the plate and turn the large gear counter-clockwise to back-up the ram screws (at least this is how it works on my model works). The gears are a little greasy so you may need to add some after messing with the gears.