My relatively new iMac 27" accepts and reads the memory stick on my Canon EOS Sxi, and my Sony dsc-h55 Cybershot. However, my wife has an earlier model Sony Cybershot, with a SanDisk Memory Stick Pro Duo, and the iMac doesn't read it. I put it in, and nothing happens. With the other mem sticks, after I insert it into the SD Card slot, iPhoto starts, and reads the contents of the card. Should it read the SanDisk Stick?