I just purchased a new. I just purchased a new Pixma MP530 printer. Installed the print head, ink,

Question

I just purchased a new Pixma MP530 printer. Installed the print head, ink, alligned print head, loaded the software, but am unable to get my Mac to recognize the printer. I have a Mac OS 10.5 and have used Pixma ip4200 for two years before it died. I cannot get the new 530 to respond and cannot figure out how to get my Mac to recognize the new 530. When I try to print all I get is the ip4200 which is no longer online. I even downloaded Print driver ver. 4.8.3 but that did no good. I'm frustrated, how can I get this new printer to respond????????????