I installed a new 250GB WD ATA hard drive in my 450mhz Sawtooth G4. The computer sees the drive, it works in target disk mode but nothing will install. When I try to install Tiger from the DVD or the 4xCD set it gives an error after a minute of installing and says to restart. The Tiger disks crash my G5 as soon as I try to boot them. When I try to install Leopard via target disk mode from my G5 it says it cannot be installed on this computer. This isn't one of the computers that has to have the OS installed in the first 8gb of the drive partition is it? I don't want to install 10.3, too much of my software isn't compatible with it. It was running 10.4 fine on the old 30gb drive.