I was using Mac OS 9.2.2 on my iBook, as I sometimes do, usually I use OS X 10.2.5. After using Word and some other software (nothing unusual) I do a simple reboot - an error message shows up: "This startup disk will not work on this Macintosh model. Use the latest Installer to update this disk for this model. - (Reboot button)" I rebooted several times, nothing changes. So I boot up using my custom boot CD (created using bootcd&mac os 10.2.5) run disk utility (disk check an permission repair). I try again. I still get the same result. So I switch the startup system to OS X 10.2.5 using my custom CD. Everything seems fine, I try to start Classic, I get the same error message in the Classic environment window. What should I do, I already tried resetting the PRAM. Would reinstalling the classic invironment from CD mess things up? Where are the software, files and settings that recognise&identify the system located, I might just replsce these with the ones form a backup.