I use a D-70. Formatted a memory card in the camera. made 161 images which i could view on my camera LCD. removed a few images from the camera memory card. Remaining images viewable on the LCD as I scrolled through the images. Inserted USB connector to camera to upload images to Bridge. Camera LCD displayed "No Images in Folder" (I know there are images. Went outside and photographed a robin and the images was viewable on the camera LCD. Tried to upload all images, including the robin images..."No Images in Folder." Removed card from camera and inserted card into card holder..No Imagesin Folder." selected 3 other memory cards which contained images. inserted cards, one at a time, into camera. Display on all three cards "No Images in Folder." I know there are images on those cards. Questions: 1, is this a camera mechanism problem? 2. card is authorized for use with Nikon and card was formatted in camera. Is this a card problem? 3. Three other image bearing cards did not display images on LCD and I got "No Images in Folder." message on the LCD.. What is the most likely problem? This situation has never occurred previously. NOTE: recently I have had the LCD display "Format" or No Images" or "FOR" or "CHA" in the info area of the camera...I simply removed the card and returned it to the camera and the FOR or CHA signal disappeared. What is the significance of these "alert" readings? Thank you for your help and consideration.