XP boots with no problem as is out of the box. all four unlock in BIOS and show unlocked on all four but the comp will not boot. So I have gone back to default settings. Later I am going to unlock one at a time and see if XP will boot. Also have Ubuntu 10.4 on second drive and neither will boot with unlocked as quad.
if non of the os boots, then i think y dont u try to reinstall an os after unlocking the cores?