I'm using the ADV7280 configured to auto-detect the input video signal. When no input signal is present it should output a blue screen. If I power up my board with NO signal on the video input the output video is scrolling red, blue, and green horizontal bars (I don't think this is a test signal... just noise?) . With my board still powered up I input a video signal (from a camera). The ADV7280 locks and a valid picture is displayed. I then remove my input video signal and the expected blue screen appears. My question is, why didn't the blue screen appear upon power up?