I have had a D3100 for a year, no problems until now. I am unable to delete photos. I tried the button on the card to lock and unlock, but no luck. I just bought a new card thinking maybe the old card is corrupted, but I'm experiencing the same problem.
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1. Select an image. Display the image in full-frame playback or playback zoom or highlight it in the thumbnail list in thumbnail or calendar playback.
2. Press the AE-L/AE-F button. The photograph will be marked with a key icon. To remove protection from the photograph so that it can be deleted, display the photograph or highlight it in the thumbnail list and then press the AE-L/AE-F button.
To remove protection from all images in the folder or folders currently selected in the Playback folder menu, press the AE-L/AE-F and Trash icon buttons together for about two seconds during playback.
Formatting memory card isn't working. Kind of a weird problem!
Please help me folks! :(
Suggest any solution if possible.
My email neal1210@live.com
It's also possible for the card itself to become defective, and one thing you should do before going too much further is to see if the camera works properly with another card. I realize in the original post this is the case, but it's something you should always check.