problem with 2.4

Hi I ve a problem with kernel 2.4 (suse ppc 7.1 out of the box) on a power mac G3 beige in fact I can t boot with the kernel 2.4 (only whith 2.2.x) during the boot the screen turn black at a moment (not always a the same moment), it seems to be a video problem. I use the integrated video card (framebuffered), but i've 2 PCI video card too (without any screen connected). do you think i have to remove these cards or to give the kernel some parameters (and which one) help THX