Thanks for all the suggestions,but I seem to have screwed up the machine to the point where all your help is unavailing. Several months ago, I upgraded the old Hard Drive to OS 9.2.2 by downloading bit and pieces from 9.0.4 on. Somewhere in there, the CD burner ceased working. Since then The G4 will not start up with the original OS 9 disk. It will start up with an OS 10.2 and a disk for OS X that came with my son's reconditioned iBook.Out of all the possible Drive Set-Ups I can open, the only one that seems to offer hope is that which came with the iBook; It shows both the old and the new drives, only it says that the new drive is the start up drive and the old drive can be initialized. I think that the old drive is still numbered 0 and the new 1.With this information, I am wondering if I could switch the jumpers around and maybe cause enough confusion that it might allow me to initialize the new drive.But I read somewhere that it was potentially dangerous to use a CD of an OS for another type of Mac. In this case, an iBook. Now,if there is a disk in the cd drive, the computer will only start up from that disk, and then it takes about 5 minutes while it displays several icons to show that it does not know from which disk to start up.