Bought an Optio S last weekend at the college bookstore. It had been there for some time. I got it because I already had one Optio S and wanted one more for the family with all the same eqipment (battery, charger, etc.). It worked fine for the weekend but the other day I used it and it won't see the SD card. I have tried the SD card from my other Optio S and it doesn't work either. When I try to format the card throught the camera menu, it only formats the internal camera memory. I reset the firmware and still no luck.