DZ2500 Problems

First thing I'd try is to cycle the power to it, and try again. If not, try pushing the button and helping the arm, perhaps its stuck or snagged a gear tooth. If still nothing, take it off of the switch, look it over and see if it will operate when its not mounted. This would likely be indicative of something rubbing  on the mechanism when its on the table, or perhaps a piece of ballast is stuck in the machine, etc...

Its a couple tiny screws to open up the machine and look it over... worth a try. If you leave the power connected, you can power up the circuit board outside of the housing and see if the motor is running, etc...