Also, I don't know if it's possible, but try in BIOS to disable unnecessary devices and set SATA to compatible/legacy (or enhanced for change). And make your CPU to use one core and disable any hyperthreading/virtualization/whatever options (if possible)! You know, minimalise it :)
Finally, try booting off 64-bit or 32-bit cds along with these two boot options (together): noapic pci=noacpi
teej, have you tried with 32-bit Ubuntu Intrepid?
Also, I don't know if it's possible, but try in BIOS to disable unnecessary devices and set SATA to compatible/legacy (or enhanced for change). And make your CPU to use one core and disable any hyperthreading/ virtualization/ whatever options (if possible)! You know, minimalise it :)
Finally, try booting off 64-bit or 32-bit cds along with these two boot options (together): noapic pci=noacpi