It may help to review the lowendmac discussion about this machine. http://www.lowendmac.com/ppc/mdd-power-mac-g4-dual.html If I follow this thread correctly, you already installed OS X 10.2 on your MDD. Did you check the box for installing OS 9 Disk Drivers? And you have the Firmware Update 4.4.8. That is fine, but not required for the machine to run with either OS. It is generally best to install OS 9 before installing OS X. That is to ensure that the OS 9 Disk Drivers are installed. If you install OS X first, there is a check box in the Disk Utility Partition window where you can install the OS 9 Disk Drivers. That will prepare the machine for installing and running OS 9.2.x . OS installers that came with a specific model are designed by Apple to work only with that model. You need either the OS 9.2 installer designed for your MDD or a retail version of 9.2.x. With your retail version of OS 10.2, I believe you already have the OS 9 installer, usually on the second disk of the set. Other things to think about -- with a Google search on "OS 9.2 retail," you can find OS 9.2.1 available. Also, a Google search on "OS 9.2.2 for MDD" gets you more info. Others have been there before you. The normal path to the 9.2.2 Update is via the free Apple download, but you can find it in disk images or other non-Apple CDs. Good luck! Let us know how you make out. Al Poulin On Mar 3, 2008, at 5:20 AM, Paul wrote: > 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. > _______________________________________________ > G4 mailing list > G4 at listserver.themacintoshguy.com > http://listserver.themacintoshguy.com/mailman/listinfo/g4 >