alpha4 and geforce3

I have a apple G4 Cube dual booting tiger and suse 10.1 alpha4. I upgraded yesterday from alpha3 , the kernel changed from 2.6.14-2 to 2.6.15-rc3 and at the first boot it seems loading kernel the video output rediredt to modem port and I couldn' t see anything on my monitor. I ssh from another machine and reintalled the previus kernel and everything is fine now (Im posting from the Cube).May be I have to modify something in my lilo.conf? May be the new kernel is bugged? Aanyone has any suggestion? thanks Andrea