Regarding Nordicktrack treadmill 3000: had been running fine; tried to use it after month of non-use, all the "dash" lights came on, inclination moved up and down; but, when tried to start the belt, there was no motion, no sound as if trying to run. Meantime, all timers etc were running. Any idea why belt doesn't run, and how to fix it or get it started again? Thank You.