I have a P4DP8-G2 motherboard. I upgraded my video card to a Geforce FX 128MB, but now the SCSI BIOS disappeared and I cannot boot up the system.
This is because the shadow ROM is not large enough to fit both the Geforce card and the SCSI controller. After the Geforce card is loaded, there is not enough shadow ROM left for the SCSI controller. You may want to try some video card that uses less shadow ROM.