Congratulations. You accomplished the equivalent of a heart-lung-brain transplant on your computer, and it still lives. But barely. The most important change is the processor upgrade (from a G3 to a G4). You should check the upgrade vendor's website for anything that has to be modified or added to the stock configuration to make that particular upgrade work. Does the vendor say that Panther will or will not work with the upgrade? Are you confusing OS9 with OS10? AFAIK, from the factory, all G3 Macs started in OS9. Did you install classic or OS9 on your "new Mac"? In the Startup Disk preference panel, which OS has been selected as the startup disk? If you're happy with that selection, then multiple OS folders on that disk won't be a problem. (I think you should get more and better answers from your professional. ;-) ) I can't understand how you can have a corrupt system or system folder. The normal way to install a new hard drive requires you start the machine from Apple's CD and use the CD to install the operating system on the new hard drive. In my experience with new drives, the OS will either install ok or will quit the install with an error of some sort. So if OS X installed, it should work fine, leading me to wonder if someone moved things around, or if there's confusion about what apps will run with OS X. What to do? I recommend you first verify the processor upgrade has been successfully installed. That's the most major change you can make to any Mac, and you should check with the vendor about potential glitches. If you haven't been able to do anything with the "new Mac", consider starting over with the hard drive system install. Use Disk Utility to erase and repartition the drive, then check the drive and - if it's ok - reinstall Panther. You may have to use ExPostFacto <<http://www.versiontracker.com/php/feedback/article.php? story=20040901224341884>> to get a good install. BTW, what processor upgrade was it? Vendor? And which G3? Good luck. Jon On Apr 17, 2005, at 2:57 PM, Carlie Van Winkle <coalcreekcarlie at yahoo.com> wrote: > I had entrusted the upgrade of my system to a > professional ...