Chosen Solution

Suddenly I started getting an error message that that memory card is locked (it’s not). Same message no matter what card I put in. Will not reset–format memory care is grayed out.

Have you unlocked the memory card itself? Try to formate the memory card on a laptop and then try to use it Update (09/09/2016) Did you format using the correct SD card formatting tool? You can it downloaded from sdcard.org Or you can try to do a hard reset on your camera.

  1. Remove battery, Memory card, and lens for about 30 seconds
  2. Reinsert just the lens and the battery, power the camera on ensure you are using an approved card: Answer Title: Approved SD cards for D5200 Answer Link:https://support.nikonusa.com/app/answers…
  3. The camera settings can be restored to default values by holding the “Menu” and “i” buttons down together for more than two seconds (these buttons are marked by a green dot). The information display turns off briefly while settings are reset.
  4. Hit the menu button and select custom setting menu
  5. Select “F” for controls and then “F4” labels " Slot empty release lock"
  6. Highlight “Enable release”
  7. Test camera with no card/ then reinsert the card and try again