diop Sorry to hear that @diop. One of the tricky things about my particular symptoms are the lag - it can take a week or two to feel fully 'in the clear' after changing setup, so it might be worth persisting a little? Just to confirm - run dxdiag from the start menu and make sure that in the Display tab it is the basic adapter that is currently in use? And also have you installed ditherig?
I understand that the BIOS screen shouldn't really be giving you trouble so perhaps it is a hardware issue. It's so hard to know..