It's very likely that while your old machine saw the disk as ad4, the new one could see it as ad0,1,2... etc. I'd take TerryP's suggestion and get a FreeSBIE LiveCD, and attempt to find out through dmesg what it's showing up as (dmesg | grep ad). Then you can mount the disk and modify fdisk as needed. After that's done, if you still want, run fsck through the livecd as well, but I'd recommend seeing if it works after modifying fstab first.
As for ACPI, see if you can kill it through the BIOS.
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