Sorry to say it guys but I am trying to get a downloaded version of tiger to install on my old mac, its a G4 450mhz D-A, I use the old girl as part of my music set up. It has a DVD drive that works 100%, but it doesn't even notice the tiger disk when it inserted! The copy is working because its worked on other macs, but not mine I have tried booting from it, but nothing I try works! Any ideas?