Logic crashes when initializing Core Audio

Logic will not start up without having to hold down the ctrl key. Once it opens it will not play any audio. Under preferences/Audio/Driver, if I select core audio driver, and attempt to enable it then select try(re)launch - Logic will become unresponsive and will have to be force quit. DAE is disabled and Direct TDM is also disabled.


I am running a Powerbook G4 with Tiger 10.4.5
Logic 7.0.1
I am also running Protools LE 4.0 with MBox

There is an identical Powerbook here at work running the exact same software versions and it is running fine.

Any thoughts from anyone?
yakeman