Long story short, jumper cables were hooked up backward. After that, only the backlight works. No image is being displayed.
Radio still plays, HVAC controls are still functional. Just no actual image is being displayed.
Checked the condition of the CD in the trunk, and it looks mint.
I'm not sure if I should throw the $150-200 for a new navigation screen, or try to dig deeper into wiring which I don't really have time for. I believe I checked the correct fuses, and they were fine.
Really running out of ideas here, and I'm not sure what to check.

A shop disconnected the battery during repairs and didn't use a saver, so now it's completely dead and I'm assuming it wants the code.