Zymon

First of all, I presume you've cleared CMOS on the BIOS.. (Including removing battery, AC cord and leaving for 30mins+.. I know DFI boards can be picky about resets..) - Do you have the latest BIOS for your mobo? (Even if you do, I'd recommend re-flashing it as a last resort) Also, as Stoic Joker mentioned^.. MPS might be worth a look, IF you have options for it... - If you do, and it's set to MPS 1.4, try with 1.1 - I believe it relates to ACPI table handling... Good luck!