Hi all. I have a recently purchased 2008 pathfinder. The screen in the middle of the dash is blank. It looks black in the daytime but glows white at night and drains the battery. Therefore it is getting power but not working. I have tried another used screen bit it does the same thing. I also have no hvac controls for the front. The front just seems to blow steady everywhere. Rear hvac works just fine. What do I need to change to get the screen working and to get the hvax working? Also are the 2 problems related ?