2.4.2 kernel on PowerBook 3400c?

Hi, I'm having trouble getting 2.4.2 to work on my 3400c. I was able to get it running beautifully on my 7200 desktop, and followed the same procedure on the 3400. No luck. It only boots to the point of the first line written to the screen: "Welcome to Linux, kernel 2.4.2" or something like that. Then it freezes and I have to do a hard reboot and go back to 2.2.16. Oh, these are both running the basic SuSE 7.0 installation. Anybody know whassup? Thanks for any help. --Isaac