If everything still works but no belt movement, you motor controller is more than likely shot. If replacing you want to also pay attention to the deck and belt. Sence it sut down while running, it sound it an over heating problem which is usually caused from too much friction between the walking belt and the deck(the board under it) May require lube or may need replacing.

When you power up the treadmill ensure the progam you choose is p1, as you may have pressed the select mode button by mistake and the treadmill is on a 10 minute countdown??? if the belt stops at exactly the same time every time then this is what has happened...it is easily done! jamie