Hi y'all, my first post. I'm running a PowerPC G4 Quicksilver Dual 1.25Ghz with 2GB RAM and OSX 10.4.11. I've purchased a Leopard upgrade and the message I get right at the beginning is that it cannot find Mac OSX 10.4 to upgrade. I've phoned the Apple unhelpline and after half an hour of waiting, abandoned ship. Any ideas?