Did you take anything apart to move it?
OK did any wires get pinched at all? Did it get dropped or bumped? 99% of the time it's a pinched wire, bad connection or damaged Motor control board after a move. Being it's older the electronics get very brittle and even a Little bump can damage the board
if all the wires are good then you will need to replace the Motor control board. You can order one from fitnessrepairparts. Com or Treadmill doctor com
Well that leaves the board. It's an easy Repair. Just remove the Motor cover with a screwdriver to access it.
Just make sure to unplug from wall ;)
Please rate my answer, thanks!
You can Check each wire with a volt meter to see if they are damaged. But since you have power and everything works but Motor that's a tell tale sign of a bad board. I replace 10-15 boards every week. It's very common