I tried taking a new image....still it didn't show...
Tried a new SD card...bingo! We're back in business.
At least I now have a file on the computer with all the images from the SD card.
But that doesn't explain how a two-thirds full SD card suddenly starts taking the photos on,as far as the camera is concerned....but not the laptop.
I've only got to re-take two images, thankfully!!