Navigation screen
Since both the GPS and camera are involved, there is probably a problem with a video processor internal to the radio unit. If this is the case, you are probably looking at replacing the unit. However, you should look for a set DTC code using a code reader before going down that road. Resetting any DTCs may correct the problem.
SOURCE: Navigation screen 07 Denali is black?
THERE IS USUALLY A FUSE BEHIND THE UNIT IT SELF AND CHECK YOUR FUSE BOX
IT MIGHT BE UNDER THE STEERING WHEEL CLOSER TO THE DRIVER DOOR OR UNDER THE HOOD CLOSE TO THE BATTERY OR ACROSS ON THE PASSENGER SIDE
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