Kathi, thanks for your post. This raises an interesting question - I have actually tried system CD’s from the following computers in my MDD, all without luck : Power Mac G4 Quicksilver -Mac OS 9.2.2 PowerBook G4 Titanium 800 Mhz -Mac OS 9.2.2 iBook (I don’t know which model) -Mac OS 9.2.2 None of these work. It’s obvious that at this point in time Apple was trying to make it very difficult to use OS 9, and wanted users to switch to X. So when you say that all that is needed is the correct version of 9.2.2 for the computer, I would have thought that the best way of finding the correct version would be to track down the original machine CD's. Of course, if Apple had released a retail version of 9.2.2, well................ > Hello, all... > As I recall from a recent thread about installing OS9, the only way to > go > back to a previous OS, is to wipe the drive clean. My experience with > installing OS9 is that I was able to install it OK on my Digital Audio > with > Panther, but was unable to install it on my MDD, 1.25Mhz that had > Tiger. > So to sum up, you do not need the original disks to install OS9. You > just > need the correct version of OS9 for the machine. 9.1 did not work for > me. I > had to find a 9.2 version of OS9 on ebay.