So I have another PowerBook G4, it is 12" model with 1GHz G4, first with USB 2.0 I think. I'm trying to install Leopard via USB because optical drive is apparently broken. I just got the machine and the drive does make usual sounds on bootup but it seems that something is blocking discs, they cannot be pushed in. I dont' think there is disc already because it does not start spinning it on power on, one explanation is that wrong screws are in place because the machine has been opended before... but that's not the issue I'm looking at the moment. USB installation goes fine until get to the point where files should be copied, it displays Calculating... and then the indication bar's animation stops and that's it. Machine keeps running and mouse moves, USB keyboard has lights and I can switch between windows (I have installed log open) and at the moment there is beach ball. I used this same USB stick on an older PowerBook yesterday and it worked fine, altough because of USB 1.1 speeds installation took very long.. but USB stick should be fine. This machine which I try to install has relatively large hard disk for its time, 250GB, I don't know if that has anything to do with it... Any tips?