I moved photos from pc to sd card but my camera is not reading?

Question

i have nikon s550

Answer 1

And it will not.

Your (and all other digital cameras) are not designed to be used as an image viewer.  Once the image files are copied to your computer, those files (the ones on the computer) cannot be copied back to your SD card and be viewed by the camera.

The LCD is designed to check the images you take using the camera to make sure they are exposed or composed properly ... they are not designed to be used as image viewer, although it is tempting.

Answer 2

throw camera against wall