My G4/400/AGP just will not install OSX. When I try to use the Panther disk I can't even get to the installer - I just get a grey screen... I CAN install OS 10.1.3 but after it installs I can't get it to launch - I end up at a grey screen. I've done a clean install... I've checked RAM...I've done the firmware upgrade... Well, using control/option/shift/delete has got me booted into 10.1.3 but I still can't get 10.3.3 to boot. Ack... Any help out there?