Have you tried replacing the batteries? It sounds like the batteries may just be too low to wind film, but can function without a load.
I can't remember if the N90S has the vertical grip release or not, but if it does, have you attempted to use it, to see if the camera functions from that release, or on fully manual settings with a cable release? Are there any error messages reading out on the LCD top panel or in the viewfinder? Are you using an attached flash? What settings are you using?
If it's not functioning, on any settings including manual with film loaded, then it's most lilely in need of a visit to a repair shop to figure out where the issue lies.
But, I'd try new batteries first.
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