I recently received a free iMac G3. It has a 500 mhz G3, 20g hd, cd-rw, and I upgraded the ram to 256mb. I think I can get a copy of either 10.2 or 10.3 from a friend. He has upgraded to 10.4. Will these cds work since they have already been used? Does each new version come with a new serial number so the old serial numbers aren't in use anymore? I'm setting this computer up for my wife and I think OS X would be a little easier for her than 9.1. Also, I want to be able to run a few programs that will only run on OS X, like Gimp. Thanks. Edit: Also, I really would like iPhoto on this computer. I don't really care about the rest of the iLife programs. Is there any way of getting just iPhoto or would I have to buy all of iLife? Where would be a good place to buy an older version.