Yes. There is a little connection right next to the USB ports. It looks like |square|
You can check apple.com I believe they are called DVI connectors. So under store go on the left side near bottom of the page and click "cables" or (more accessories)
well it actually depends on what model imac g4 you have. The early models used mini VGA and the later imac g4's used mini DVI. You should be able to pick up either adaptor at the apple store.
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