Too much information.
Check to see that your vent system is clear.
This includes the lint trap, flex vent pipe from dryer to wall flange, and the flappers on the outside flange vent thingy.
If dryer is electric, reset the breaker (turn off and back on). If it is half tripped, the motor may work (120v) but the element will not (240v).
If it's a gas dryer, maybe you didn't pay the bill?