Johnsondh 0 Newbie Poster

Does anyone know if I can upgrade my iMac G3 to a G4 processor? I run 10.3.9 (600 MHz) and have 512 MB RAM, but there's obviously stuff I can't do unless I have at least a G4. I've found conflicting stuff on the web about whether I can upgrade, and how. Do you have any idea of cost?

Thanks.