It is hard to tell exactly what is wrong without seeing it in person, but I can tell you what to look for. First check the power coming to the dryer.... is a breaker tripped? If you have fuses, make sure both fuses for the dryer are good. Even if only one is bad the dryer wont work. If you have a volt/ohm meter, you can check for power, first at the dryer receptacle, then where the cord connects to the dryer. It is important to wear safety glasses when doing this. Then you might check the door switch on the dryer. It is one of the first parts to go bad on some models. If you are not familiar with electricity, it would be good to have an experienced person check out your dryer.