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It sounds like the belt switch needs to be triggered. Down next to the motor, there is a plastic switch that looks like the one in the link below
CLICK HERE to see belt switch
This switch is triggered if the belt gets loose or the drum drops down a bit. The tensioner pulley next to the motor will come and push the black plunger toward the motor and that cuts power to the motor. Just remove the back panel of the dryer and push the plunger back TOWARD the tensioner pulley and then try the dryer and it should work again. You may have to push the plunger back and forth a couple times if it sticks but that should be your problem if the door switch is all connected when you re-assembled the dryer.
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