Camera issue after replacing the battery?

I have the vehicle listed above with The Platinum trim. The other day I needed a jump-start. I wound up buying a new battery. The old one was the original one installed at the factory in 2015! After the battery was installed, I didn't immediately check the camera on the front screen until an hour later. Turns out the camera is blacked out and the radio has no sound. All the other buttons, though, besides the camera, illuminate and are active, such as the Menu. You can toggle through the various screens in the menu, for example. But once you press camera, none of the other "buttons" illuminate or are functional.

I checked all the fuses today and they are fine. At the same time, we tried the "secret menu" (Radio off, hold Menu button while spinning the volume knob). Once in the secret menu, an online video said to touch the upper, left-hand arrow to do a factory reset. [There were only two clickable menu items, which I didn't touch, as the video was only about doing a factory reset.] When we did that, after a few moments, the camera was activated! But once we touched Menu, then returned to camera, it was blacked out again. While driving home, we put the vehicle into reverse and the rear camera mysteriously activated - momentarily.

Additional Information: The Platinum trim has a sunroof. I park it under a tree. I had been using a cover for it, but I guess not religiously. I get a lot of rain where I live. Right now, very little. But about 5 months ago, I had some water dripping in on the front passenger side. I had the sunroof drain cleared, but I didn't dry out/replace part of the carpet fast enough. So, around that time, after having had the drain cleared, I started the vehicle one day and noticed an odd mark on the screen. When I turned the heater on high, the mark disappeared. That problem hasn't re-occurred in the past 4 months. Is it possible some of the connectors behind the screen got corroded from the high levels of humidity at the time?