I have a 700idt that I was preparing to install in my truck. I had it setup on the bench and running for a couple days then all of a sudden it stopped displaying signal or osd. The power light will come on and the screen flashes white real quickly then no signal and it goes into standby ( flashing power light). I read on here that means the controller is still good. I removed and reset all the ribbon cable connections. Anyone have another idea?