Hi, thank you for contacting JustAnswer.com. My name is***** will do my best to provide the right answer to your question.
I would say there are only 2 things to say about the matter of your question, which you have explained quite well: either
1. the camera was damaged in other ways that in the optics of the lens, by being dropped. That's quite possible, really - even for a while after being dropped, weaknesses can turn into cracks outright, etc.
2. the settings are somehow obstructing operation. I doubt this, but to be quite sure: do a Factory Settings Reset on the camera. This will erase white balance settings and custom settings of yours, but will not erase pictures stored on the camera.
This is done, by holding down the +/- [Exposure Compensation] button and the AF Mode button down together for several seconds or until the screen shuts off and the camera is obviously restarting. This will set settings back to factory-release default values.
If the problem continues after doing the reset in (2) your camera will need either repair-servicing, or replacing. Nikon Repair may be engaged through https://www.nikonusa.com/en/service-and-support/service-and-repair.page
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