i hooked up my clarion vrx765vd today and i grounded the dvd cable to the chassis. I scraped the paint away from the hole where the wire makes contact with the car and then i screded it onto the frame. I turned the car on and the dvde player worked. so i was curious and turned the car off and turned it back on. And the dvd no longer works. it says audio only, just like it did when it was not grounded. I took the screw out and re screwed it. and again it worked. so i shut the car off and once again it does not work! whats wrong with it does anyone know? please help i can't figure this out!