New answers tagged nikon-d5100
It is supposed to always work. The battery is the first thing to check, try recharging it, but maybe you already have. If it does not turn on with a fresh battery, then it sounds like it needs service.
Sounds like you just need a new battery: They all eventually need to be replaced. I have had good luck with Wasabi brand batteries for Nikon DSLR. The current firmware for D5100 is a couple of years old. Nothing newer is available. https://support.nikonusa.com/app/answers/detail/a_id/13783/~/current-firmware-available-for-nikon-products
From the description you've supplied it looks like your battery has failed and needs replacing. The easiest way to test it is to find someone who has another d5100 near you and try your battery in their charger / camera. The d5100 is a very popular body and it is likely that someone you know has one (or another camera that uses the same battery.) Li-ion ...
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