Before we get into the"Dude just get a new one" thing, I am typing this on my 20" intel iMac. I picked up the old one to give to my dad for internet use. It is a 400Mhz DV with 500M of RAM. It has no operating system on it. I would like to put 10.3 on it. What type disk do I need? Does it have to be an "off the shelf" version or would a disk set from the likes of say an eMac work on this computer? Sorry if this is a dumb question as this 20" is my first Mac and I know very little about how Apple OS works on older machines. Thank you.