Audio Systems: car stereo not working, nissan altima 2002, fuse boxes

Question
my factory stereo in my nissan altima 2002 will not torn on when a start the car there is no display at all

Answer
Probably a fuse. Have you checked them?  There are two fuse boxes in this car; one under the hood near the battery, the other inside under the dash between the steering column and the drivers door.

If not a fuse then it has lost power; maybe the wire from the ignition to the stereo/radio is broken or open circuit somewhere.

Hope this helps.