Only 12 months warranty? Most Nikons come with more than that.
On the old lenses, with an apperture ring, the apperture had to be set to the smallest available, f22 for example when fitted to a dslr. If not you got an f message. This being the case and after refitting your kit works fine maybe you did not secure the lens adequately? Why not try taking the lens off and then replacing it a few times trying the camera at each reload? It's worth a go I think. But make sure you register your camera and lens with Nikon, and check what warranty you have.
I hope this is of help.
Dean.
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