I have been a Windows user for many years, but this week I inherited an iMac G5 (10.4.11 Tiger) and I feel like one of the blind men trying to discern the characteristics of an elephant. I'd like to start, I guess, with making the iMac my own. There are many remnants of the previous owner still on the drive so I'd like to format the HD and start fresh. Two questions: 1. How do I format the drive 2. How do I get the original programs and apps that came with the unit back on? I have no backup installation disk and I don't know if I can get one from Apple. I have been remarkably unsuccessful in egtting any messages to Apple.com support since I am old my serial number (which I got from "About My Mac") doesn't exist. Any advice would be appreciated.