I went to the tip and found an old G5 iMac running OSX Server. I tried to reset it by taking away the .applesetupdone or something file but now I just don't know what version it is and what the server serial number is. How do I get Normal Mac OS X on?
First of all you need to buy a retail copy of OS X 10.5; already it's beginning to cost more than it is worth. Just install Linux on it and run that instead. But again, you're going to end up with something that any cheap modern PC will run rings round. Why not just leave it running the server software?