We are having the same problem. The cause seems to be that the aluminum rod on the pusher assembly no longer pushes out the stainless safety pin (on the bottom of the work bowl lid) a sufficient distance to start the processor. The maximum the pin will extend when pushed out using the pusher assembly is 7mm, but when I press against the wheel inside the top of the work bowl cover with a small screwdriver, I can easily extend the pin to 9mm. This 2mm difference prevents the cusiinart from turning on when fully assembled. Not sure if the little plastic wheel wore down, or something got bent inside the mechanism that pushes the pin out, but this is the problem - the safety pin isn’t extending sufficiently to allow the cuisinart to run. Not sure what cusinart will be willing to do except sell me a new work bowl lid and pusher assembly because the unit is out of warranty.