White Apple Logo Computer, Want to Use Remote

I have a white apple logo computer and want to use my silver colour apple remote. Sorry I'm not that good with all this computer jargon, but when I press pause the music on my computer doesn't pause.

LOL I was taking the ****, I have an imac g5 which has an ir blaster, I'm trying to use the aluminium apple remote that came with my apple tv with iTunes. I followed a guide that apple gave that suggested bringing the remote up to the imac and pressing play/pause as well as enter or something similar. Anyway I don't have the orginal white remote and was wondering if it's even possible to pair the apple remote with an imac g5.