Control and display panel is working but it wont start?

My GE Microwave Oven model JE12340WPSL was working perfectly well until one time it stopped working. The programmable control panel containing the digital display and control buttons is working but after setting-up when you push the start button it just wont start? What to do? Do I need to replace the whole control panel? If yes, where can I avail it? Please help, thank you!