Hi Rich
Sorry you're having a bad time with this. To answer your earlier question, yes I have the RNS 510.
I've just been out now and checked a few things. You don't need the Aux Input enabled, mine isn't.
At present I have an iPod Classic attached to the 32 pin connector. When the door is opened the charging circuit is activated to the iPod and it starts to charge, and after a few seconds it goes off if I don't turn ignition or radio on.
If I turn the radio on, the charging circuit is activated again.
With the iPod disconnected, on the "Settings" screen, the "MDI" button is greyed out. When I plug it in, the MDI button becomes active and I am able to select it.
Let me know if there is anything else you want me to try.
Colin