Macs are so much more enlightened than PCs! There is no difference between Master and Slave on a Mac! But, I'd guess that the drive with OS X is either dead or corrupted. --Steve At 1:13 PM -0700 10/16/06, Carol Leger wrote: > OS X is on a drive on the slave bus. One thing I will try is to select OS 9.x as the startup drive before I shut down next time. I have had OS X selected as the startup disk.