I just recently bought a 17" iMac intel core duo and I'm wondering which OS X it needs? After a great deal of searching, I can only find OS X for the Core 2 duo....as that was the next series in the intel line. Also, I've borrowed a usb mac keyboard from a Mac Pro to use with it but it doesn't seem to respond with it. I read somewhere that the old plastic iMacs also came with this certain plastic white keyboard. Does it need to have the original kb to use it? I would have though practically any usb kb or mouse would work with it. Am I wrong? Thanks.