I had my Clarion screen installed today. The face turns on but when the screen gets pulled out it doesn't work anymore. Somebody told me it has something to do with the ground (someone said I might have 2 grounds ???). Anybody have ideas. I know the screen works because we just took it out of my cousins car. I remember he had it grounded to the e brake so you could only use it with the brake on but the guy that installed it on mine said he grounded it on the same spot my cd player is grounded.