Alan Beagley:
the following is what works for me with my Asus M2N-SLI Deluxe motherboards (nVidia chipset), AMD dual-core CPU and LSILogic U320 SCSI card:
PSD=ACPI.PSD /APIC /SMP /!NOD
The ACPI documentation is confusing, especially (IMO) wrt the /!NOD switch: at one point I was told to remove that switch, which I had found I had always had to use, and with that particular version of ACPI removing the switch solved the problem. When the next version came out, I found by trial and error that I had to restore the switch. A later version of the docs. announced that the switch was no longer needed, but I found that I still needed it.
