AT-LP120XUSB Turntable adapter

Hi, I bought a AT-LP120XUSB turntable, and after 2 days it stopped spinning, I went and requested it to be fixed, and they said that the adapter was "broken". Not sure what they meant with the adapter is broken, so now, I am looking for help trying to find what I did wrong with it, not sure if it was to do with too much power, since it was in a wall socket, or maybe it had some thing to do with the cables with which it was connected on my speaker system. Since my speaker doesn't have an exit for ground, just left and right speaker, I connected that, and for the ground just loosened one screw on the back and connected the ground there.

EDIT: Didn't start, but stop spinning.