I purchase a used Power PC G4 laptop from my son's freshman roomate. That was about 4 years ago. I have the passwords and I'd like to install some new software, but they require I upgrade to Leopard, I'm currently running Tiger. However, I found out that to upgrade to Leopard, I need the original install disk, which he never gave me. I wasn't very computer savvy, so I didn't know to ask for them. I know the kid's name and state, but I guess he's still listed under his parent's name, so the phone directory is no help. The school is not allowed to give me his contact info. So, I went to an authorized apple repair facility, they want $150 to do it, plus they won't install the Leopard OS I just bought, they said I had to buy a new Leopard OS from them, but because I broke the seal on my set, I can't return it. Before I spend that kind of money, is there a way I can just reformat the HD and install Leopard myself? (Snow Leopard isn't compatible with my Power PC) Any help would be much appreciated.