I have several older Macs (7100/80, Radius 80/110) that have OS9.1 installed but I want to wipe them clean before eBaying them. I have factory OS8 and OS9 cd's and have tried to boot up onto the cd's on several systems with no success. I hold down the "C" key while powering on and it boots right to the installed OS. I have used every imaginable configuration with different systems, keyboards, and cd's. My original plan was to boot up to the cd, use the disk utility and erase the hard drives but that doesn't seem possible. Any ideas?