My D3 went to a multi-colored screen of static during one flight and now when the power cord is connected to the unit but the cigarette lighter is not plugged in, the unit will not power up. I leave the cigarette lighter unplugged during startup because it’s on the battery bus and it’s easier to plug it in quickly than trying to find the connector on the side of the unit. The unit powers up fine once the ship power is available and it works fine on battery power. Ideas? I don’t remember this being normal.