Take one of the memory cards and put it into the card reader on your computer.

Your computer will see it as being a new hard-drive.

Use Windows Explorer to find the card reader/memory card.
See if you can find anything on the card.
If so.....delete all files and all folders on the memory card.

Remove the card and put it into your camera.
Do not format the card with the camera at this time.

See if you can take some photos on the card.
If so....now find the format command on the camera and format the card.
Try taking some photos.


If your card now works......do the same for your other cards.
If your card doesn't work.....at what point did it fail to work?