If popcorn does not pop, it is usually the result of environmental factors such as the freshness and moisture content of the popcorn, or variances of popcorn type. Always use fresh popcorn kernels, that are ideally of a small or medium size. Also, make sure that you do not stop and start the microwave. Stopping the microwave prematurely can dissipate the heat build-up and prevent the kernel from popping.
