I have an iMac G3 500, and i bought a 4GB memory stick for it, but when i plug it in it doesn't appear. Is it an incompatibility with the hardware? is it usb 1.1 in general? Its running os 10.4 so it could be the os as well, but i don't think so. i know its not the memory stick because i tested it on another computer. And yes i tried the keyboard ports and the ones on the machine itself.