I referred to the profile you created in the website and see that you have no model number listed of your dryer. From the symptom your describing the motor is just humming when start is pushed.
Open the dryer door and reach in and see if you can rotate the dryer drum counter clockwise. We need to eliminate a friction problem with the drum rollers. After turning the drum around a few times and its turning easily shut door and push start. If the dryer starts this could indicate a centrifugal switch or motor problem.
I'd recommend to have a service technician diagnose and repair your dryer.