I inserted a USB memory stick into my Powerbook G4, and it was fine, as always. Here's the problem: someone yanked it out while a (Word) file was still up and running. I don't think it got damaged, it wasn't a particularly forceful yank. Now I stuck it back in, and the computer's not reading the stick. The icon isn't showing up, and I can't get to my files. Is the file lost? How do I get the stick to work?