2013 A6 Prestige 3.0 Supercharged 100k/miles

Vehicle starts and seems to run mechanically fine...however none of the HUD/Dash/MMI displays work at all.

I had the car parked out in the open-air for about 2 weeks (holiday travel with family) because I had a project set up in the garage/car-port. It rained a lot during that time and I don't know if there might have been a moisture problem that caused something to short out? I've been working too much and haven't had time to really dive in to troubleshooting, thought I'd ask and see if anyone had any ideas/previous experience.

Thanks!

 

My 2009 A6 Avant had a similar problem- entire display and MMI would fail then come back, eventually failed completely. Turned out to be a bad wiring harness so that power to the main MMI computer was cutting in and out (and eventually fried it). Expensive fix, hope yours isn't as bad The tech literally diagnosed it by chance- accidentally pulled a wire while checking it out and it came back on!. I suspect it will take a dealer's computer to sort it out. Best of luck.

Dave