Mac OS X Version 10.4 requires a Macintosh with:
* PowerPC G3, G4, or G5 processor
* Built-in FireWire
* At least 256MB of physical RAM
* A built-in display or a display connected to an Apple-supplied video card supported by your computer
* At least 3.0 GB of available space on your hard drive; 4GB of disk space if you install XCode 2 developer tools
* DVD drive for installation (get CD media for $9.95)
I recently knew that Tiger doesn't support iMac, any chance
that it can with any other programs?
You are currently running 10.3.9 on your G4 iMac and if so, which specification of your iMac model does not meet the minimum system requirements for Tiger?