Karen. I believe that you will need a retail copy of Tiger. Tiger if it is on a computer's system discs will only work on that specific model. Whereas the retail versions of of any iteration of OS-X will work on any Mac. Lately there are limits to which generation of Mac that Leopard will work with. However I have been reading that there are tweaks to also make it functional on any Mac. Bill > > I might have access to a *legal* copy of Tiger install disks once the current > user upgrades to Leopard. Would those work on a G4 if they came with an intel > 2.4GHz aluminum imac? I'm a little hesistant to try a new OS when I have a > 30GB hard drive and 640MB of ram... > > Thanks again.. > > -Karen