Hey guys, im new to this board and i kinda need your expertise. I just recently hooked up a screen and dvd player to my car. I had an AUX imput on my radio so i hooked the the DVD AV wires to that and then the video wire to my screen. now the DVD player and the screen work perfectly when the car is off but as soon as the car is on it'll start to hum with the engine of my car ... what i did was pull out the radio and the humming noise stopped... so i put the radio back in, and it would be fine until i turn the radio on and off again!