Hi sue1759
The first thing I would do is check the continuity across the start switch terminals. It should be normally open and if it's closed then replace the start switch.
How did you check the air flow? Did you dis connect the vent hose from the dryer?
- The pat number for the new start switch
AP2042901
- Here are the break down diagrams for the GE dryer
Model DX4500GA1WW
Good luck.
Gene.