I'm sorry, but I think you have probably bricked your screen. I have bricked at least three of these screens, and I know that it doesn't take much to do it. I know your screen is a little different than the ones I used, but the principles are probably still the same. My screens kept dying until I started running them off of a regulated 12V source. Now, maybe your car has wildly fluctuating voltages that destroyed the screen. I don't know. I think the screen is dead though.