and make sure that you have all the connections connected.
Does the drive spin when you power on the PowerBook?
What does System Profiler show when you are booted from the 10.4 installation disk?
My hard drive quit responding and the disk utility showed a sector error and would not repir. I got a new 250GB WD drive, installed it and now the disk utility will not see it when i try to install OS X 10.4. What am I doing wrong?