Cup wont press down onto motor grips

Have you got something caught in it? Is it still under warranty? I am guessing but the mechanism inside the base should drop when you push to twist. Check is this is happening. If not then that may be the problem

This happenned to my daughter's nutribullet recently. All three parts of the grip and starting mechanism were stuck. I took the machine apart and found where the grips operate up and down on coil springs. Took them out, placed some grease in the holes, and reinserted the springs and other mechanisms. After I reassembled the blender, it works perfectly.