I can attest to the fact that on my two machines (Powerbook 1.67 & Powermac Dual 1.42) it seems neither will detect and run the Leopard installer off the Leopard retail upgrade DVD if I'm already running Leopard. The disc just spins up then wirrs away for a while then repeats the cycle endlessly (or for however long I'm willing to hold the 'C' key down for). I even tried booting from the disc by restarting while holding down 'Option' and this allowed me to select which device I wanted to boot from, but of course once I continued then again it never got past the Apple logo screen and the disc just endlessly repeated the cycle of spinning up, wirring away for a while then repeating the cycle. After two days I had to resort to using the Tiger install DVD to install 10.4.2. After Tiger was installed only then would my powerbook detect and run the Leopard installer off the upgrade DVD.
Now I can do the same thing on my Powermac and install Tiger first, but really I shouldn't have to so I'm wondering if this is an issue with PowerPC Macs or is there's a weird problem with my Leopard DVD (maybe a bit got set on the disc during duplication that if accidently set won't allow the computer to run the installer if it detects Leopard is already installed on the target machine ie some kind of anti-piracy measure like the region select bits on a commercial movie DVD that if not set correctly will cause the player to refuse to play the disc).
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