I have a 6 year old Maytag electric dryer. It stopped running in the middle of a load and will not start. The interior light is out (I tried a new one) and it worked before. The timer works - it will advance- but the dryer refuses to come on when it is pushed. I have checked the door switch as a potential source of the problem with a continuity tester and it appears OK. Not sure what to try next.