Having spent ten minutes wading through yahoo trying to join AmithlonOpen, I`ll try asking here instead

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I recently upgraded from a well-supported Amithlon system to an Asus a8v (kt-800pro) which I understood was compatible. The problem is that now Amithlon won`t boot at all, not even as far as the ball - it`s just a black screen after loading the kernel. I have tried both Bernie`s kernels and Bombcrater`s latest one as well to no avail. I do have 2 gig of ram but I`ve tried mem=512m with no effect. I am using a 9800xt graphics card. As a last ditch before I give up, can anyone think of any bios settings or kernel options I might try?
thx
Will