I have a Zio memory card reader that we use for the digital camera at work. It works on every Mac I have plugged it into, with the mounted drive icon showing up on the desktop. That is, every Mac excpet for mine. For whatever reason, the thing completely refuses to respond with my G5. I googled this thing, and the product info says it needs no drivers or software to work with the mac, and the Apple page has it listed under the supported readers for iPhoto. ANy ideas why it won't work on my computer?