Nikon D750 problem

Last Tuesday - 31 March, I took delivery of my (new) Nikon D750 with 24 - 120 F4 lens and I have spent time reading the manual and setting it up.
I have taken around 350 pictures but today, when I switch it on, instead of the normal display of aperture, shutter speed etc. it just shows AF-S S
I cannot look at menus, or playback, it just freezes.
Any ideas ????
Thanks for any advice.
I have taken around 350 pictures but today, when I switch it on, instead of the normal display of aperture, shutter speed etc. it just shows AF-S S
I cannot look at menus, or playback, it just freezes.
Any ideas ????
Thanks for any advice.

Thanks for your replies. It completely froze and I was unable to do anything - not even a factory reset. Tried another lens and battery but still dead.
The camera has been returned to the supplier and I am expecting a replacement to be delivered later today so hopefully this one will be ok.
Thanks again
The camera has been returned to the supplier and I am expecting a replacement to be delivered later today so hopefully this one will be ok.
Thanks again