OSD minum overlay screen

I am using a Pixhawk with a Minum OSD display in a 2 channel aircraft, but the problem is that ‘no input data’ comes up on the screen when turned on, BUT after about 65 seconds, the screen I set on the config tool comes up for about 2 seconds, and then the display goes back to ‘no input data’ for another 65 seconds, before coming back up again for another 2 seconds, before returning to the no data message. How can I correct that problem? I am getting very frustrated. I have tried so many different changes on the suggestion of a mate, who is also getting frustrated! HELP!!!