I have a Microwave Panasonic series NN-S544. Yesterday, my mom accidently enabled the child safety lock, and i disabled it by pressing 3 times the stop/reset button. The child status disappeared, but now my microwave doesn't work. I pressed any button but it didn't respone except the stop/reset button, just beep sound and nothing happen. Do you have any idea what's wrong with it and how can i fix it?