I am trying to figure out why our 2007 escalades radio/navigation does not have any power and is not working at all???????? Any clues? I hvae checked most fuses under hood and in the interior fuse panel?...

check the fuses with a meter, some get there power from a seemingly unrelated fuse that might be bad. also check the sockets the fuses plug into alot of people are having issues with the fuses not making good contact.