Back up camera has no guide lines

[69mach1-395]

So I finally got my camera and harness replaced under warranty recently, and now no lines show up in spite of me going into the screen and turning it on. My guess is that they flubbed up the installation and now they can't see me until who knows when.
Anybody deal with this on their own?
Any tips for me to try on my own?

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[69mach1-395]

Anybody?

 

[Gen 6 Mach1]

I open you trunk and close it , that may get them back . I know if you're trunk isn't latched but down they won't show up . Never know may work . Hoping the best .

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