the guide lines on my the rear view camera don't appear when backing up

What is your question?

We just bought a 2014 Santa Fe and the rear view camera worked perfectly on the lot, but not now. The camera comes on but the lines don't. There's nothing in the manual or on youtube that references this problem, just instructions on how to activate the camera, which is covered in the manual.

What makes this problem better or worse?

We have tried everything we can think of. No help in the manual or on youtube.

How long has your 2014 Hyundai Santa Fe had this problem?

We bought it two days ago and it worked perfectly on the lot.