Dishwasher ;ightson but does not make a sound

Bought DishWasher from Sears outlet about 2 weeks ago. Was a “new floor model” Been working fine. Tonight I noticed DW was full of dirty dishes, so I turned on. Lights on control panel comes on, but DW does not make a sound or function in anyway. After about a minute lights go off. There is no water in DW
Panel on door had been removed at Sears as Screws were missing down one side when I bought. Sounds like may not have been so new?

Sounds like it may have been returned or worked on. I would try to cut power/ unplug it to see if it resets. If not, take it back for a refund.