Kenmore 70 Series gas Dryer won't start

Hello. I have a Kenmore 70 series dryer model 77732791 77732 approximately 15 years old. It won't start. Has power to dryer. Light on inside is on when door is open. When you push the start button all it does is click, and won't start. Curious where I should start troubleshooting or if you had an idea of what the problem and cure would be. I did replace the motor about 3 or 4 years ago. Thanks for your time and any help.
Jamie Reuther