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Batteries that have failed are a common cause of camera failure-to-power-On.
Please tell me how old the battery you are using is. Battery age is a good piece of indicative data.
Thanks for spelling that out for me. I wasn't sure of the details.
How old is your Nikon camera, please?
Has it been dropped or otherwise mishandled in its lifetime (dropping damage often takes a bit of time to fully show up or realize itself) ?
Was this failure to power On sudden, or was there some warning of it in advance ?
Please let me know. These are important details to the case.
Probably your camera is broken.
If there are offers for premium service, you may ignore them. They do cost extra fees, of course.
Would you like to try anything, in case your camera is NOT broken ?