The dryer stopped working in the middle of drying

The dryer stopped working in the middle of drying a load of clothes.It won`t start at all now.If I turn the timer switch to the "cotton" setting,and turn the start switch,there is no ticking sound from the timer. When I turn the select switch to "regular" setting and turn the start switch and hold it on you can hear the timer ticking down,but the dryer won`t start. If you let go of the start switch,there is no ticking from the timer switch.