If you are experiencing issues with your device check out the Nikon D7100 Troubleshooting troubleshooting page to help diagnose your issue.
The Nikon D7100 is a digital single-lens camera (DSLR) that was released on February 21, 2013. It served as an update to the Nikon D7000 with features such as 24 megapixels and interchangeable lenses. The model number is Nikon 1515.
The Nikon D7000 and the Nikon D7100 are tough to distinguish from each other. The only visual difference is the “D7000” or “D7100” badge on the front of the camera.