Hi Beth. Welcome to justanswer.
Remove the memory card and turn on your camer. Now check if you can see any image in your camera.
Yes because Canon does not put internal memory in their cameras. So there is no way to retrieve images as there are no images saved without a memory card
The buffer is just a temporary memory where data is stored until it is written to the non volatile memory (memory card). Once the data is written to the card, the buffer clears itself
Sorry Beth. There is no way to retrieve data from buffer whether it is a camera, computer or any other device. The images which are shown once you connect the camera to the computer, are the only ones present in the camera
Beth are you having any trouble in saving the images to the card.
Let me know if you are having issues in saving the images so that I can help you out.
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Beth if you don't need any other help then please close the chat by rating it positively. Thank you and have a wonderful evening.