Did you ever get an answer to this happening? I just purchased a 2023 Trailblazer and less than 24 hours after picking it up, my backup camera is doing the exact same thing. Took it to the dealership and of course it was working fine for them. This morning, it's doing the same thing again.My rear camera was working fine all day. When I got back in my car, put it into reverse, the screen is black with a picture of a camera with a line through it, and a triangle with an exclamation point in it. Any ideas?