Hello, I have a G4 400 (single) "Gigabit" Powermac that I'm trying to upgrade to OS10.4 Tiger. The problem is, whenever I insert the install DVD and follow its instructions to restart, I get a crazy grey screen with power button and a message about Powermac 3.3 something driver failed... I successfully installed 10.3.9 but I cannot ever seem to get the tiger install to work!~!! It had OS 9.x (9.0.x I think) until a week ago, am I doing something wrong The specs are: G4 400 Single Gigabit Ethernet 640mb (64mb+64mb+512mb) Ram 20GB (OS9)+80GB(OS10.3.9) Hdd's plus everything standard... Please help if you can!!!