Format the SD card IN THE CAMERA and try again.
If it fails, be sure to be ready to answer the maker's question about you trying another card.
After the formatting of the card and a re-test. If it fails I'd move to returning the product as defective if a call to support doesn't fix it in one try.
Hope you bought it with a credit card.
I just purchased the Canon SD 780 IS and have a question abiout the video. For some reason, we can only shoot a video for 30 seconds, then it flashes busy on the screen and stops recording. Is there something I'm doing wrong? I am using a brand new 8GB SanDisk memory card and the book states we should get approximately 40 minutes of video with an 8GB card.
Any help would be greatly appreciated.