Radio question.
 

Hi all, first post here, been a lurker for a while. My fiance has an 05 E53 with the standard radio/cd player. Several months ago, i spent a whole day trying to hook up a Grom. I hooked it up to the wrong wires, then finally found the correct ones, but could not get it to work. Long story short, i pulled the Grom out and re-connected everything in its factory manner.
The display will not turn on now. The radio plays music for about a minute, then turns off.
All fuses are good.
I read that i could have drained the battery down, and caused the car to be in transport mode (the thread i found has the same identical issue)
Plugged in my INPA software, and got into the radio. There is an option for (transport mode - on)(transport mode - off).
Selected off, expecting the display to come to life...nothing. Tried several times, re-checked fuses, still nothing.
I am at a loss, i am not much of a radio/electronics guy.
Any help would be greatly appreciated!

Bump, does anyone have any idea? Or any input on what i should try to replace?

Does INPA show the radio as working correctly? On mine it shows an error for radio because I have an aftermarket Android head unit.

I dont remember exactly, but i dont think it showed any sort of error or fault codes.

Ok, is there anyone with an E53 in the Dayton, Ohio area that would be willing to meet up and plug your radio display in mine to see if that is the issue? I dont think it is but I am running out of things to try