First off, i know this is a topic that was probably discussed quite a bit about 5 years ago, and I already searched MR forums with no luck, so I'm gonna go ahead and post. My goal is to revive my struggling iMac G4 (800MHz, 512 MB ram, 10.3.9 Panther) so I can use it again or give it to a friend. Everything is extremely slow, and applications are constantly crashing. It was originally loaded with 10.2 Jaguar, but I installed Panther years ago. I recently got my hands on Tiger, but when I try to install it, the loading bar doesn't get an eighth of the way before it stops and gives me an error message. The hard drive is loaded with about 50 gigs of useless stuff that my family has downloaded over the years, mostly small strange files. So my theory is that maybe after reformatting the hard drive, I might be able to get it to install. So finally to my questions. What would I need to do to reformat? Would I use the original install disks? Would I need my Panther disks as well? Is there any tips or advice that you have that could possibly help, even if it isn't related to reformatting? If you need any further info, just ask and I'll post it. Any help or advice would be greatly appreciated.