Just got a good old classic Titanium Powerbook G4 with a bargain price. It was installed with 10.4. No recovering DVD was included. I tried to upgrade it to 10.5, by using Cabon Copy Cloner to clone the whole harddisk from my White Macbook with 10.5 Yes, I know I was stupid! As a result, the G4 will power up but always hang at the grey Apple logo screen! I've tried to reinstall 10.5 from DVD. But the G4 will not read Double Layer DVD. It was a backup of a retail version of 10.5. My other installation disk are only recovering DVD so it won't install in this G4. What can I do now? How can I install 10.5 in this G4? Thanks guys.