I tried with both nvagp and agpgart and it is the same result.
But as you I suspect an AGP compatibility problem. As a GeForce 5200 seems to work correctly, I got the opportunity to try one. And at boot I get a black screen
My motherboard is an ASUS CUV4XDLS with a VIA Chipset and an AGP Pro Slot told to be backward compatible with AGP4X/2X.
Did some one meet the problem with an ASUS motherboard ?, did you solve it ?, do I have to tune the bios. The AGP strength is set to OxEA.
Thanks for reply.