Hi. My name is*****'m a camera repair technician with over 20 years in the business and I'll be glad to help you with your question today.
This is an electronic problem an will need to be diagnosed professionally and really isn’t a user serviceable problem and should be repaired by a qualified technician. You may want to check locally for a camera repair shop in your area, or, if you need assistance finding a shop, please let me know and I'll locate one for you.
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Actually, I'd send it directly to the Nikon facility in Torence. I'll need to be programmed with Nikon specific software. Here's a link that will get you started with their repair process.