The light is on on the inside of the dryer but it will not start. it stopped suddenly in mid-cycle

check the belt around the drum

When u press the knob to start the dryer is there a buzzing noise ???

If so i guess u nee to order a new moter ...
u can do it at..www.appliancepartspros.com

with no light it tells me you have lost L1 check your outlet, and your wire connections
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You may be experiencing "Heat Retention" by stopping your dryer mid-cycle, which you should NOT ever have to do! If you have a minor vent restriction or if you open the dryer mid-cycle when the heat is on, this will cause a disruption in the airflow and rising temperatures can keep the dryer from restarting until it has been cooled long enough.
Check your vent all the way to the outside for restrictions/obstructions every 6 months. Clean your lint filter after each load and DO NOT stop the dryer mid-cycle!
Note: Stopping the dryer mid-cycle can also cause severe burns and even melt polyester fibers.

Check the circuit breakers for the dryer first. Remember when you reset the breaker, to turn it all the way to the OFF position firmly and then back on.

check thermo fuse in rear, kills motor and heat, white in color. Not resettable, must be replaced. ck with multimeter.

Sounds like you might need a new motor.

Inside the drum is 2 long metal trips that measure capacitance in the clothes as they get dryer. Sometimmes liquid fabric softener gets on them and stops the process. Wipe them off. They are right on the filter housing inside just below the filter.

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make sure of mode# make inside door and I will help you. also how old is your drier?

This sounds as if the internal fuse has blown. I am assuming you have checked the breakers as well. The starter switch might be bad.