Hi and welcome to the Mac community and the G4 list. Technically, the install disc you describe is licensed for the Mac Mini hardware only and isn't supposed to be sold/used on another system. In many cases, system CDs that are made for specific systems (like this one) will not install on other systems. They look for specific hardware to key the install and will not properly install on another system. Some of the OS9 CDs that were OEM with specific systems will install on other hardware, however. Your mileage may vary. If you are looking for OS 9.x, you can usually find cheap copies on eBay. I've also found them at fastmac.com. If you want OSX, you want to make sure you're getting a "retail" install CD, which is one that is designed to install on any supported hardware. If you have a G4/450 tower, you can use any version of Mac OSX up to and including 10.4.x (Tiger). Hope that helps. -Hal On Apr 19, 2007, at 8:18 AM, Rob Marles wrote: > Hi There > > My Mac currently has a sloppy install of OS 9.2 and I wanted to > clean it off and install something fresh. > > Would a copy of OSX advertised as "Apple Mac OS X 10.4 Tiger Full > Install for PPC G4 Mini" and "1.25 and 1.42 ghz Power PC G4 Mac > Mini" work? > > I don't know what a Mac Mini is as I'm new to the Mac world, but I > would assume it utilizes the same architecture? > > Thanks in advance!