Update from 10.3.9 to new 10.5 will not work.

trying to update my G4 iMac 2003 with panther 10.3.9 OS. I put my new leopard OS X disc into the drive and read everything i need to on the disc. I press the install button, then the restart button on the instalation window. The system reboots and stays on a grey screen with the color waiting wheel for hours and hours on end. There is no end to the waiting. After a good few hours of waiting, i decide to quit. Do i need to buy tiger OS X because my panther OS is too old to update all the way to 10.5? Or, is my iMac not compatible with the new 10.5 Leopard OS X? Is Mac trying to scam me into buying a newer system?

See the specs at http://www.apple.com/macosx/techspecs/

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