2010 pathfinder head unit problems

[Ray1984]

I have a 2010 pathfinder and i have been having problems with the head unit. At first the it would turn off then after awhile it would turn back on.now it will not turn on at all.the only buttons that work are the rear defrost and the load and eject buttons all the other buttons dont work. I was wondering if anybody knows whats up if there is a fuse thats bad or somthing else. I also cant get my sat radio to work amd my lights on the steering wheel radio and shifter dont work.