Hi, I am planning on completely erasing everything on my computer and reinstalling Mac OS X. Of course, before actually doing this, I go to look for my Mac OS X installation CD, and cannot find it. However, we have a couple other Macs - one G4 I book with its installation CD, and a Mac Mini with its. My computer is a GD Powerbook though. Can I use one of these startup CD's for my computer? Do I need to first get my serial number before? And how would I do this?