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A couple years ago I installed an Avidyne IFD550 and an overall panel upgrade. I have been very happy with the IFD550, although I have only used it for VFR since I have never gotten it to work correctly with the Stec 60-2 AutoPilot. That's another subject we can discuss some time. My problem now is that the IFD has simply failed. I have attached two short videos. I last flew the plane on 5/29/2020 since my annual expired at the end of May, but I go out every couple weeks and run the engine for about 15 to 20 minutes. I have delayed starting on my annual because my long time AP had a stroke last year, and I am trying to work with another AP that will come to the Warsaw airport and work with me. I have the guy lined up and he will allow me to perform an assisted annual, but we just have not started on it yet due to scheduling (both his and mine). Having said all that, I went out to the hangar yesterday evening and pulled the plane out for it's 15 minute run on the tarmac and the IFD would not boot up. I think the video will explain. There was a difference if the engine was running or not??? Also, something that is not shown in the video is that the system voltage is running at 13.9 volts, whereas past JPI data shows it consistent at 14.2 +/- .1 volts. The IFD acts "better" if the engine is off and the ship voltage is setting at 11.9 Please watch the short videos, the 5964 is engine off, 5965 engine running Thanks, -mark IMG_5964.MOV IMG_5965.MOV