Two years ago, I bought a (new) Nikon D5100 from BestBuy. Shortly thereafter I bought a SanDisk 8GB SDHC card that I have used without incident since...until now. Last week I started intermittently getting the message " No SD card inserted", and occasionally a message that the card was damaged. Popping the card out and then putting it back in however seemed to resolve the problem. In the past few days however the camera has simply ceased to recognize the card, nor will recognize either the Kodak 2GB SD card that I originally used with it, or an old PNY 1GB card, this despite the fact that my old Canon SX20 works just fine with all three.
I have Firmware 1.01 preinstalled, and have tried the following fixes:
1.) Reformatting card on a Win7 computer(cannot reformat on camera as it will not detect), as well as on my SX20
2.) Can-of-Air'ing the card slot to remove any dust
3.) (Carefully) cleaning contacts on cards
4.) Pulling card and battery, waiting a moment and putting both back in.
Does anyone have any ideas before I ship the thing off to Nikon?
As a sidenote, I believe the night before this began, the card access light came on when I reinstalled the battery after charging it, and stayed on for several moments.