Can’t boot to SCSI drive

I had a PC working fine with no IDE drives, just two SCSI drives. I take the SCSI card and drives from that PC and put it into a new case with new motherboard and CPU. The machine will not boot. How can I get it to boot from the SCSI drive?

1. During the POST, I see the proper messages from the SCSI BIOS.
2. I have the motherboard BIOS set to boot first from “Option Rom.”
3. If I boot from a Win98se diskette, I can see the two SCSI drives with proper partitions and data. If I try to manually run Windows at this point, I get a VxD error.
4. I’m not doing any overclocking or non-standard stuff like that.

Motherboard: Intel D815eea
Chip: Celeron 733
RAM: 320 MB