> Try updating the bios or down grading the bios... I have a ABit 64 bit > machine that had issues, but it was tied to the bios rev.. > > john You might also want to try looking in the BIOS for an "Installed OS" setting. I had a machine that wouldn't boot certain kernels and it was solved by simply changing a BIOS setting to 'Linux' Also have you tried any boot options on the grub prompt such as acpi=ht or pci=conf1?